Commit 3f98734e authored by Dan Carpenter's avatar Dan Carpenter Committed by Greg Kroah-Hartman

mwifiex: fix mwifiex_rdeeprom_read()

commit 1f9c6e1b upstream.

There were several bugs here.

1)  The done label was in the wrong place so we didn't copy any
    information out when there was no command given.

2)  We were using PAGE_SIZE as the size of the buffer instead of
    "PAGE_SIZE - pos".

3)  snprintf() returns the number of characters that would have been
    printed if there were enough space.  If there was not enough space
    (and we had fixed the memory corruption bug #2) then it would result
    in an information leak when we do simple_read_from_buffer().  I've
    changed it to use scnprintf() instead.

I also removed the initialization at the start of the function, because
I thought it made the code a little more clear.

Fixes: 5e6e3a92 ('wireless: mwifiex: initial commit for Marvell mwifiex driver')
Signed-off-by: default avatarDan Carpenter <dan.carpenter@oracle.com>
Acked-by: default avatarAmitkumar Karwar <akarwar@marvell.com>
Signed-off-by: default avatarKalle Valo <kvalo@codeaurora.org>
Signed-off-by: default avatarGreg Kroah-Hartman <gregkh@linuxfoundation.org>
parent a8bfcb9f
......@@ -637,7 +637,7 @@ mwifiex_rdeeprom_read(struct file *file, char __user *ubuf,
(struct mwifiex_private *) file->private_data;
unsigned long addr = get_zeroed_page(GFP_KERNEL);
char *buf = (char *) addr;
int pos = 0, ret = 0, i;
int pos, ret, i;
u8 value[MAX_EEPROM_DATA];
if (!buf)
......@@ -645,7 +645,7 @@ mwifiex_rdeeprom_read(struct file *file, char __user *ubuf,
if (saved_offset == -1) {
/* No command has been given */
pos += snprintf(buf, PAGE_SIZE, "0");
pos = snprintf(buf, PAGE_SIZE, "0");
goto done;
}
......@@ -654,17 +654,17 @@ mwifiex_rdeeprom_read(struct file *file, char __user *ubuf,
(u16) saved_bytes, value);
if (ret) {
ret = -EINVAL;
goto done;
goto out_free;
}
pos += snprintf(buf, PAGE_SIZE, "%d %d ", saved_offset, saved_bytes);
pos = snprintf(buf, PAGE_SIZE, "%d %d ", saved_offset, saved_bytes);
for (i = 0; i < saved_bytes; i++)
pos += snprintf(buf + strlen(buf), PAGE_SIZE, "%d ", value[i]);
ret = simple_read_from_buffer(ubuf, count, ppos, buf, pos);
pos += scnprintf(buf + pos, PAGE_SIZE - pos, "%d ", value[i]);
done:
ret = simple_read_from_buffer(ubuf, count, ppos, buf, pos);
out_free:
free_page(addr);
return ret;
}
......
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