4.9-stable review patch. If anyone has any objections, please let me know.
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From: Herbert Xu herbert@gondor.apana.org.au
commit 900a081f6912a8985dc15380ec912752cb66025a upstream.
When we have an unaligned SG list entry where there is no leftover aligned data, the hash walk code will incorrectly return zero as if the entire SG list has been processed.
This patch fixes it by moving onto the next page instead.
Reported-by: Eli Cooper elicooper@gmx.com Cc: stable@vger.kernel.org Signed-off-by: Herbert Xu herbert@gondor.apana.org.au Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.org
--- crypto/ahash.c | 7 ++++--- 1 file changed, 4 insertions(+), 3 deletions(-)
--- a/crypto/ahash.c +++ b/crypto/ahash.c @@ -91,13 +91,14 @@ int crypto_hash_walk_done(struct crypto_
if (nbytes && walk->offset & alignmask && !err) { walk->offset = ALIGN(walk->offset, alignmask + 1); - walk->data += walk->offset; - nbytes = min(nbytes, ((unsigned int)(PAGE_SIZE)) - walk->offset); walk->entrylen -= nbytes;
- return nbytes; + if (nbytes) { + walk->data += walk->offset; + return nbytes; + } }
if (walk->flags & CRYPTO_ALG_ASYNC)