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authorTim Chen <tim.c.chen@linux.intel.com>2014-07-11 01:18:08 +0200
committerHerbert Xu <herbert@gondor.apana.org.au>2014-08-25 14:27:16 +0200
commit6d9529c586dbf0d356916d113f72f36397e71cdb (patch)
tree3d3d7e19b45fcadf140ce51694a84b086a87424b /crypto/ahash.c
parentLinux 3.17-rc1 (diff)
downloadlinux-6d9529c586dbf0d356916d113f72f36397e71cdb.tar.xz
linux-6d9529c586dbf0d356916d113f72f36397e71cdb.zip
crypto: hash - initialize entry len for null input in crypto hash sg list walk
For the special case when we have a null input string, we want to initialize the entry len to 0 for the hash/ahash walk, so cyrpto_hash_walk_last will return the correct result indicating that we have completed the scatter list walk. Otherwise we may keep walking the sg list and access bogus memory address. Signed-off-by: Tim Chen <tim.c.chen@linux.intel.com> Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
Diffstat (limited to 'crypto/ahash.c')
-rw-r--r--crypto/ahash.c12
1 files changed, 9 insertions, 3 deletions
diff --git a/crypto/ahash.c b/crypto/ahash.c
index f2a5d8f656ff..f6a36a52d738 100644
--- a/crypto/ahash.c
+++ b/crypto/ahash.c
@@ -131,8 +131,10 @@ int crypto_hash_walk_first(struct ahash_request *req,
{
walk->total = req->nbytes;
- if (!walk->total)
+ if (!walk->total) {
+ walk->entrylen = 0;
return 0;
+ }
walk->alignmask = crypto_ahash_alignmask(crypto_ahash_reqtfm(req));
walk->sg = req->src;
@@ -147,8 +149,10 @@ int crypto_ahash_walk_first(struct ahash_request *req,
{
walk->total = req->nbytes;
- if (!walk->total)
+ if (!walk->total) {
+ walk->entrylen = 0;
return 0;
+ }
walk->alignmask = crypto_ahash_alignmask(crypto_ahash_reqtfm(req));
walk->sg = req->src;
@@ -167,8 +171,10 @@ int crypto_hash_walk_first_compat(struct hash_desc *hdesc,
{
walk->total = len;
- if (!walk->total)
+ if (!walk->total) {
+ walk->entrylen = 0;
return 0;
+ }
walk->alignmask = crypto_hash_alignmask(hdesc->tfm);
walk->sg = sg;