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authorSasha Levin <sasha.levin@oracle.com>2014-08-01 07:00:35 +0400
committerDavid S. Miller <davem@davemloft.net>2014-08-03 02:25:21 +0400
commit06ebb06d49486676272a3c030bfeef4bd969a8e6 (patch)
treed4be5a1524d4c01f5d7cbeeee33047374f1190ea /lib/iovec.c
parentfcdfe3a7fa4cb74391d42b6a26dc07c20dab1d82 (diff)
downloadlinux-06ebb06d49486676272a3c030bfeef4bd969a8e6.tar.xz
iovec: make sure the caller actually wants anything in memcpy_fromiovecend
Check for cases when the caller requests 0 bytes instead of running off and dereferencing potentially invalid iovecs. Signed-off-by: Sasha Levin <sasha.levin@oracle.com> Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'lib/iovec.c')
-rw-r--r--lib/iovec.c4
1 files changed, 4 insertions, 0 deletions
diff --git a/lib/iovec.c b/lib/iovec.c
index 7a7c2da4cddf..df3abd1eaa4a 100644
--- a/lib/iovec.c
+++ b/lib/iovec.c
@@ -85,6 +85,10 @@ EXPORT_SYMBOL(memcpy_toiovecend);
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;