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| author | Tim Chen <tim.c.chen@linux.intel.com> | 2014-07-10 16:18:08 -0700 |
|---|---|---|
| committer | Herbert Xu <herbert@gondor.apana.org.au> | 2014-08-25 20:27:16 +0800 |
| commit | 6d9529c586dbf0d356916d113f72f36397e71cdb (patch) | |
| tree | 3d3d7e19b45fcadf140ce51694a84b086a87424b /crypto/ahash.c | |
| parent | 7d1311b93e58ed55f3a31cc8f94c4b8fe988a2b9 (diff) | |
| download | lwn-6d9529c586dbf0d356916d113f72f36397e71cdb.tar.gz lwn-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.c | 12 |
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; |