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| author | Eric Biggers <ebiggers@google.com> | 2019-01-31 23:51:41 -0800 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2019-03-23 14:35:10 +0100 |
| commit | 09024fed4e52b7cfef8721584c4d8658f65fa151 (patch) | |
| tree | 8dcac8be96c3a190ed1cae4f0438e138132a8e92 | |
| parent | 68a4425031bce034fcd987495d6ecc8c0d15faa7 (diff) | |
| download | linux-stable-09024fed4e52b7cfef8721584c4d8658f65fa151.tar.gz linux-stable-09024fed4e52b7cfef8721584c4d8658f65fa151.tar.bz2 linux-stable-09024fed4e52b7cfef8721584c4d8658f65fa151.zip | |
crypto: ahash - fix another early termination in hash walk
commit 77568e535af7c4f97eaef1e555bf0af83772456c upstream.
Hash algorithms with an alignmask set, e.g. "xcbc(aes-aesni)" and
"michael_mic", fail the improved hash tests because they sometimes
produce the wrong digest. The bug is that in the case where a
scatterlist element crosses pages, not all the data is actually hashed
because the scatterlist walk terminates too early. This happens because
the 'nbytes' variable in crypto_hash_walk_done() is assigned the number
of bytes remaining in the page, then later interpreted as the number of
bytes remaining in the scatterlist element. Fix it.
Fixes: 900a081f6912 ("crypto: ahash - Fix early termination in hash walk")
Cc: stable@vger.kernel.org
Signed-off-by: Eric Biggers <ebiggers@google.com>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
| -rw-r--r-- | crypto/ahash.c | 14 |
1 files changed, 7 insertions, 7 deletions
diff --git a/crypto/ahash.c b/crypto/ahash.c index 3980e9e45289..5bec16ebbf8b 100644 --- a/crypto/ahash.c +++ b/crypto/ahash.c @@ -86,17 +86,17 @@ static int hash_walk_new_entry(struct crypto_hash_walk *walk) int crypto_hash_walk_done(struct crypto_hash_walk *walk, int err) { unsigned int alignmask = walk->alignmask; - unsigned int nbytes = walk->entrylen; walk->data -= walk->offset; - if (nbytes && walk->offset & alignmask && !err) { - walk->offset = ALIGN(walk->offset, alignmask + 1); - nbytes = min(nbytes, - ((unsigned int)(PAGE_SIZE)) - walk->offset); - walk->entrylen -= nbytes; + if (walk->entrylen && (walk->offset & alignmask) && !err) { + unsigned int nbytes; + walk->offset = ALIGN(walk->offset, alignmask + 1); + nbytes = min(walk->entrylen, + (unsigned int)(PAGE_SIZE - walk->offset)); if (nbytes) { + walk->entrylen -= nbytes; walk->data += walk->offset; return nbytes; } @@ -116,7 +116,7 @@ int crypto_hash_walk_done(struct crypto_hash_walk *walk, int err) if (err) return err; - if (nbytes) { + if (walk->entrylen) { walk->offset = 0; walk->pg++; return hash_walk_next(walk); |