aboutsummaryrefslogtreecommitdiff
path: root/crypto/scatterwalk.c
diff options
context:
space:
mode:
authorHerbert Xu <herbert@gondor.apana.org.au>2007-12-14 00:44:11 +0800
committerHerbert Xu <herbert@gondor.apana.org.au>2008-01-11 08:16:54 +1100
commit6e050778c5d08a97d5d98f7cb62bc503e872615c (patch)
treeb58022ec4378bbfb51291c68da914ce64a526db8 /crypto/scatterwalk.c
parentce5bd4aca3c467936370846119b7f3daf9ccea78 (diff)
downloadlinux-6e050778c5d08a97d5d98f7cb62bc503e872615c.tar.gz
[CRYPTO] scatterwalk: Handle zero nbytes in scatterwalk_map_and_copy
It's better to return silently than crash and burn when someone feeds us a zero length. In particular the null digest algorithm when used as part of authenc will do that to us. Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
Diffstat (limited to 'crypto/scatterwalk.c')
-rw-r--r--crypto/scatterwalk.c3
1 files changed, 3 insertions, 0 deletions
diff --git a/crypto/scatterwalk.c b/crypto/scatterwalk.c
index 297e19d13c4..9aeeb52004a 100644
--- a/crypto/scatterwalk.c
+++ b/crypto/scatterwalk.c
@@ -105,6 +105,9 @@ void scatterwalk_map_and_copy(void *buf, struct scatterlist *sg,
struct scatter_walk walk;
unsigned int offset = 0;
+ if (!nbytes)
+ return;
+
for (;;) {
scatterwalk_start(&walk, sg);