Commit 12ef6094 authored by Sasha Levin's avatar Sasha Levin Committed by Ben Hutchings

iovec: make sure the caller actually wants anything in memcpy_fromiovecend

[ Upstream commit 06ebb06d ]

Check for cases when the caller requests 0 bytes instead of running off
and dereferencing potentially invalid iovecs.
Signed-off-by: default avatarSasha Levin <sasha.levin@oracle.com>
Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
Signed-off-by: default avatarBen Hutchings <ben@decadent.org.uk>
parent a57d246b
......@@ -157,6 +157,10 @@ EXPORT_SYMBOL(memcpy_fromiovec);
int memcpy_fromiovecend(unsigned char *kdata, const struct iovec *iov,
int offset, int len)
{
/* No data? Done! */
if (len == 0)
return 0;
/* Skip over the finished iovecs */
while (offset >= iov->iov_len) {
offset -= iov->iov_len;
......
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