Commit 1eb83e09 authored by Paul Mackerras's avatar Paul Mackerras Committed by Linus Torvalds

[PATCH] Fix check warnings in PPP code

This patch removes the warnings that the check program came up with in
the PPP code: ppp_async.c, ppp_deflate.c and ppp_generic.c.  This
involved adding __user and converting K&R-style function definitions
to ANSI-style.  I also took the time to add some extra comments to
ppp_deflate.c explaining in more detail what each function does and
what its arguments are.
parent 2a1775fd
......@@ -427,12 +427,12 @@ ppp_async_ioctl(struct ppp_channel *chan, unsigned int cmd, unsigned long arg)
break;
case PPPIOCGXASYNCMAP:
if (copy_to_user((void *) arg, ap->xaccm, sizeof(ap->xaccm)))
if (copy_to_user((void __user *) arg, ap->xaccm, sizeof(ap->xaccm)))
break;
err = 0;
break;
case PPPIOCSXASYNCMAP:
if (copy_from_user(accm, (void *) arg, sizeof(accm)))
if (copy_from_user(accm, (void __user *) arg, sizeof(accm)))
break;
accm[2] &= ~0x40000000U; /* can't escape 0x5e */
accm[3] |= 0x60000000U; /* must escape 0x7d, 0x7e */
......
......@@ -57,29 +57,31 @@ struct ppp_deflate_state {
#define DEFLATE_OVHD 2 /* Deflate overhead/packet */
static void *z_comp_alloc __P((unsigned char *options, int opt_len));
static void *z_decomp_alloc __P((unsigned char *options, int opt_len));
static void z_comp_free __P((void *state));
static void z_decomp_free __P((void *state));
static int z_comp_init __P((void *state, unsigned char *options,
static void *z_comp_alloc(unsigned char *options, int opt_len);
static void *z_decomp_alloc(unsigned char *options, int opt_len);
static void z_comp_free(void *state);
static void z_decomp_free(void *state);
static int z_comp_init(void *state, unsigned char *options,
int opt_len,
int unit, int hdrlen, int debug));
static int z_decomp_init __P((void *state, unsigned char *options,
int unit, int hdrlen, int debug);
static int z_decomp_init(void *state, unsigned char *options,
int opt_len,
int unit, int hdrlen, int mru, int debug));
static int z_compress __P((void *state, unsigned char *rptr,
int unit, int hdrlen, int mru, int debug);
static int z_compress(void *state, unsigned char *rptr,
unsigned char *obuf,
int isize, int osize));
static void z_incomp __P((void *state, unsigned char *ibuf, int icnt));
static int z_decompress __P((void *state, unsigned char *ibuf,
int isize, unsigned char *obuf, int osize));
static void z_comp_reset __P((void *state));
static void z_decomp_reset __P((void *state));
static void z_comp_stats __P((void *state, struct compstat *stats));
static void
z_comp_free(arg)
void *arg;
int isize, int osize);
static void z_incomp(void *state, unsigned char *ibuf, int icnt);
static int z_decompress(void *state, unsigned char *ibuf,
int isize, unsigned char *obuf, int osize);
static void z_comp_reset(void *state);
static void z_decomp_reset(void *state);
static void z_comp_stats(void *state, struct compstat *stats);
/**
* z_comp_free - free the memory used by a compressor
* @arg: pointer to the private state for the compressor.
*/
static void z_comp_free(void *arg)
{
struct ppp_deflate_state *state = (struct ppp_deflate_state *) arg;
......@@ -91,13 +93,21 @@ z_comp_free(arg)
}
}
/*
* Allocate space for a compressor.
/**
* z_comp_alloc - allocate space for a compressor.
* @options: pointer to CCP option data
* @opt_len: length of the CCP option at @options.
*
* The @options pointer points to the a buffer containing the
* CCP option data for the compression being negotiated. It is
* formatted according to RFC1979, and describes the window
* size that the peer is requesting that we use in compressing
* data to be sent to it.
*
* Returns the pointer to the private state for the compressor,
* or NULL if we could not allocate enough memory.
*/
static void *
z_comp_alloc(options, opt_len)
unsigned char *options;
int opt_len;
static void *z_comp_alloc(unsigned char *options, int opt_len)
{
struct ppp_deflate_state *state;
int w_size;
......@@ -135,11 +145,23 @@ z_comp_alloc(options, opt_len)
return NULL;
}
static int
z_comp_init(arg, options, opt_len, unit, hdrlen, debug)
void *arg;
unsigned char *options;
int opt_len, unit, hdrlen, debug;
/**
* z_comp_init - initialize a previously-allocated compressor.
* @arg: pointer to the private state for the compressor
* @options: pointer to the CCP option data describing the
* compression that was negotiated with the peer
* @opt_len: length of the CCP option data at @options
* @unit: PPP unit number for diagnostic messages
* @hdrlen: ignored (present for backwards compatibility)
* @debug: debug flag; if non-zero, debug messages are printed.
*
* The CCP options described by @options must match the options
* specified when the compressor was allocated. The compressor
* history is reset. Returns 0 for failure (CCP options don't
* match) or 1 for success.
*/
static int z_comp_init(void *arg, unsigned char *options, int opt_len,
int unit, int hdrlen, int debug)
{
struct ppp_deflate_state *state = (struct ppp_deflate_state *) arg;
......@@ -160,9 +182,14 @@ z_comp_init(arg, options, opt_len, unit, hdrlen, debug)
return 1;
}
static void
z_comp_reset(arg)
void *arg;
/**
* z_comp_reset - reset a previously-allocated compressor.
* @arg: pointer to private state for the compressor.
*
* This clears the history for the compressor and makes it
* ready to start emitting a new compressed stream.
*/
static void z_comp_reset(void *arg)
{
struct ppp_deflate_state *state = (struct ppp_deflate_state *) arg;
......@@ -170,12 +197,19 @@ z_comp_reset(arg)
zlib_deflateReset(&state->strm);
}
int
z_compress(arg, rptr, obuf, isize, osize)
void *arg;
unsigned char *rptr; /* uncompressed packet (in) */
unsigned char *obuf; /* compressed packet (out) */
int isize, osize;
/**
* z_compress - compress a PPP packet with Deflate compression.
* @arg: pointer to private state for the compressor
* @rptr: uncompressed packet (input)
* @obuf: compressed packet (output)
* @isize: size of uncompressed packet
* @osize: space available at @obuf
*
* Returns the length of the compressed packet, or 0 if the
* packet is incompressible.
*/
int z_compress(void *arg, unsigned char *rptr, unsigned char *obuf,
int isize, int osize)
{
struct ppp_deflate_state *state = (struct ppp_deflate_state *) arg;
int r, proto, off, olen, oavail;
......@@ -251,19 +285,24 @@ z_compress(arg, rptr, obuf, isize, osize)
return olen;
}
static void
z_comp_stats(arg, stats)
void *arg;
struct compstat *stats;
/**
* z_comp_stats - return compression statistics for a compressor
* or decompressor.
* @arg: pointer to private space for the (de)compressor
* @stats: pointer to a struct compstat to receive the result.
*/
static void z_comp_stats(void *arg, struct compstat *stats)
{
struct ppp_deflate_state *state = (struct ppp_deflate_state *) arg;
*stats = state->stats;
}
static void
z_decomp_free(arg)
void *arg;
/**
* z_decomp_free - Free the memory used by a decompressor.
* @arg: pointer to private space for the decompressor.
*/
static void z_decomp_free(void *arg)
{
struct ppp_deflate_state *state = (struct ppp_deflate_state *) arg;
......@@ -275,13 +314,21 @@ z_decomp_free(arg)
}
}
/*
* Allocate space for a decompressor.
/**
* z_decomp_alloc - allocate space for a decompressor.
* @options: pointer to CCP option data
* @opt_len: length of the CCP option at @options.
*
* The @options pointer points to the a buffer containing the
* CCP option data for the compression being negotiated. It is
* formatted according to RFC1979, and describes the window
* size that we are requesting the peer to use in compressing
* data to be sent to us.
*
* Returns the pointer to the private state for the decompressor,
* or NULL if we could not allocate enough memory.
*/
static void *
z_decomp_alloc(options, opt_len)
unsigned char *options;
int opt_len;
static void *z_decomp_alloc(unsigned char *options, int opt_len)
{
struct ppp_deflate_state *state;
int w_size;
......@@ -317,11 +364,24 @@ z_decomp_alloc(options, opt_len)
return NULL;
}
static int
z_decomp_init(arg, options, opt_len, unit, hdrlen, mru, debug)
void *arg;
unsigned char *options;
int opt_len, unit, hdrlen, mru, debug;
/**
* z_decomp_init - initialize a previously-allocated decompressor.
* @arg: pointer to the private state for the decompressor
* @options: pointer to the CCP option data describing the
* compression that was negotiated with the peer
* @opt_len: length of the CCP option data at @options
* @unit: PPP unit number for diagnostic messages
* @hdrlen: ignored (present for backwards compatibility)
* @mru: maximum length of decompressed packets
* @debug: debug flag; if non-zero, debug messages are printed.
*
* The CCP options described by @options must match the options
* specified when the decompressor was allocated. The decompressor
* history is reset. Returns 0 for failure (CCP options don't
* match) or 1 for success.
*/
static int z_decomp_init(void *arg, unsigned char *options, int opt_len,
int unit, int hdrlen, int mru, int debug)
{
struct ppp_deflate_state *state = (struct ppp_deflate_state *) arg;
......@@ -343,9 +403,14 @@ z_decomp_init(arg, options, opt_len, unit, hdrlen, mru, debug)
return 1;
}
static void
z_decomp_reset(arg)
void *arg;
/**
* z_decomp_reset - reset a previously-allocated decompressor.
* @arg: pointer to private state for the decompressor.
*
* This clears the history for the decompressor and makes it
* ready to receive a new compressed stream.
*/
static void z_decomp_reset(void *arg)
{
struct ppp_deflate_state *state = (struct ppp_deflate_state *) arg;
......@@ -353,8 +418,13 @@ z_decomp_reset(arg)
zlib_inflateReset(&state->strm);
}
/*
* Decompress a Deflate-compressed packet.
/**
* z_decompress - decompress a Deflate-compressed packet.
* @arg: pointer to private state for the decompressor
* @ibuf: pointer to input (compressed) packet data
* @isize: length of input packet
* @obuf: pointer to space for output (decompressed) packet
* @osize: amount of space available at @obuf
*
* Because of patent problems, we return DECOMP_ERROR for errors
* found by inspecting the input data and for system problems, but
......@@ -369,13 +439,8 @@ z_decomp_reset(arg)
* bug, so we return DECOMP_FATALERROR for them in order to turn off
* compression, even though they are detected by inspecting the input.
*/
int
z_decompress(arg, ibuf, isize, obuf, osize)
void *arg;
unsigned char *ibuf;
int isize;
unsigned char *obuf;
int osize;
int z_decompress(void *arg, unsigned char *ibuf, int isize,
unsigned char *obuf, int osize)
{
struct ppp_deflate_state *state = (struct ppp_deflate_state *) arg;
int olen, seq, r;
......@@ -474,14 +539,13 @@ z_decompress(arg, ibuf, isize, obuf, osize)
return olen;
}
/*
* Incompressible data has arrived - add it to the history.
/**
* z_incomp - add incompressible input data to the history.
* @arg: pointer to private state for the decompressor
* @ibuf: pointer to input packet data
* @icnt: length of input data.
*/
static void
z_incomp(arg, ibuf, icnt)
void *arg;
unsigned char *ibuf;
int icnt;
static void z_incomp(void *arg, unsigned char *ibuf, int icnt)
{
struct ppp_deflate_state *state = (struct ppp_deflate_state *) arg;
int proto, r;
......
......@@ -387,7 +387,7 @@ static int ppp_release(struct inode *inode, struct file *file)
return 0;
}
static ssize_t ppp_read(struct file *file, char *buf,
static ssize_t ppp_read(struct file *file, char __user *buf,
size_t count, loff_t *ppos)
{
struct ppp_file *pf = file->private_data;
......@@ -436,7 +436,7 @@ static ssize_t ppp_read(struct file *file, char *buf,
return ret;
}
static ssize_t ppp_write(struct file *file, const char *buf,
static ssize_t ppp_write(struct file *file, const char __user *buf,
size_t count, loff_t *ppos)
{
struct ppp_file *pf = file->private_data;
......@@ -617,7 +617,7 @@ static int ppp_ioctl(struct inode *inode, struct file *file,
case PPPIOCGIDLE:
idle.xmit_idle = (jiffies - ppp->last_xmit) / HZ;
idle.recv_idle = (jiffies - ppp->last_recv) / HZ;
if (copy_to_user((void *) arg, &idle, sizeof(idle)))
if (copy_to_user((void __user *) arg, &idle, sizeof(idle)))
break;
err = 0;
break;
......@@ -646,7 +646,7 @@ static int ppp_ioctl(struct inode *inode, struct file *file,
case PPPIOCGNPMODE:
case PPPIOCSNPMODE:
if (copy_from_user(&npi, (void *) arg, sizeof(npi)))
if (copy_from_user(&npi, (void __user *) arg, sizeof(npi)))
break;
err = proto_to_npindex(npi.protocol);
if (err < 0)
......@@ -655,7 +655,7 @@ static int ppp_ioctl(struct inode *inode, struct file *file,
if (cmd == PPPIOCGNPMODE) {
err = -EFAULT;
npi.mode = ppp->npmode[i];
if (copy_to_user((void *) arg, &npi, sizeof(npi)))
if (copy_to_user((void __user *) arg, &npi, sizeof(npi)))
break;
} else {
ppp->npmode[i] = npi.mode;
......@@ -673,16 +673,15 @@ static int ppp_ioctl(struct inode *inode, struct file *file,
struct sock_filter *code = NULL;
int len;
if (copy_from_user(&uprog, (void *) arg, sizeof(uprog)))
if (copy_from_user(&uprog, (void __user *) arg, sizeof(uprog)))
break;
if (uprog.len > 0 && uprog.len < 65536) {
err = -ENOMEM;
len = uprog.len * sizeof(struct sock_filter);
code = kmalloc(len, GFP_KERNEL);
if (code == 0)
break;
err = -EFAULT;
if (copy_from_user(code, uprog.filter, len)) {
if (copy_from_user(code, (void __user *) uprog.filter, len)) {
kfree(code);
break;
}
......@@ -691,7 +690,6 @@ static int ppp_ioctl(struct inode *inode, struct file *file,
kfree(code);
break;
}
}
filtp = (cmd == PPPIOCSPASS)? &ppp->pass_filter: &ppp->active_filter;
ppp_lock(ppp);
if (filtp->filter)
......@@ -879,7 +877,7 @@ ppp_net_ioctl(struct net_device *dev, struct ifreq *ifr, int cmd)
{
struct ppp *ppp = dev->priv;
int err = -EFAULT;
void *addr = (void *) ifr->ifr_ifru.ifru_data;
void __user *addr = (void __user *) ifr->ifr_ifru.ifru_data;
struct ppp_stats stats;
struct ppp_comp_stats cstats;
char *vers;
......@@ -1952,9 +1950,9 @@ ppp_set_compress(struct ppp *ppp, unsigned long arg)
unsigned char ccp_option[CCP_MAX_OPTION_LENGTH];
err = -EFAULT;
if (copy_from_user(&data, (void *) arg, sizeof(data))
if (copy_from_user(&data, (void __user *) arg, sizeof(data))
|| (data.length <= CCP_MAX_OPTION_LENGTH
&& copy_from_user(ccp_option, data.ptr, data.length)))
&& copy_from_user(ccp_option, (void __user *) data.ptr, data.length)))
goto out;
err = -EINVAL;
if (data.length > CCP_MAX_OPTION_LENGTH
......
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