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authorHerbert Xu <herbert@gondor.apana.org.au>2007-12-13 17:44:11 +0100
committerHerbert Xu <herbert@gondor.apana.org.au>2008-01-10 22:16:54 +0100
commit6e050778c5d08a97d5d98f7cb62bc503e872615c (patch)
treeb58022ec4378bbfb51291c68da914ce64a526db8 /crypto
parent[CRYPTO] null: Allow setkey on digest_null (diff)
downloadlinux-6e050778c5d08a97d5d98f7cb62bc503e872615c.tar.xz
linux-6e050778c5d08a97d5d98f7cb62bc503e872615c.zip
[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')
-rw-r--r--crypto/scatterwalk.c3
1 files changed, 3 insertions, 0 deletions
diff --git a/crypto/scatterwalk.c b/crypto/scatterwalk.c
index 297e19d13c4e..9aeeb52004a5 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);