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authorEric Biggers <ebiggers@google.com>2022-01-18 16:13:05 -0800
committerHerbert Xu <herbert@gondor.apana.org.au>2022-01-31 11:21:44 +1100
commita24611ea356c7f3f0ec926da11b9482ac1f414fd (patch)
tree0036f840ac3d82bef06c15abefac3ca522d31462 /crypto
parentd3481accd974541e6a5d6a1fb588924a3519c36e (diff)
crypto: rsa-pkcs1pad - fix buffer overread in pkcs1pad_verify_complete()
Before checking whether the expected digest_info is present, we need to check that there are enough bytes remaining. Fixes: a49de377e051 ("crypto: Add hash param to pkcs1pad") Cc: <stable@vger.kernel.org> # v4.6+ Cc: Tadeusz Struk <tadeusz.struk@linaro.org> Signed-off-by: Eric Biggers <ebiggers@google.com> Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
Diffstat (limited to 'crypto')
-rw-r--r--crypto/rsa-pkcs1pad.c2
1 files changed, 2 insertions, 0 deletions
diff --git a/crypto/rsa-pkcs1pad.c b/crypto/rsa-pkcs1pad.c
index 6b556ddeb3a0..9d804831c8b3 100644
--- a/crypto/rsa-pkcs1pad.c
+++ b/crypto/rsa-pkcs1pad.c
@@ -476,6 +476,8 @@ static int pkcs1pad_verify_complete(struct akcipher_request *req, int err)
pos++;
if (digest_info) {
+ if (digest_info->size > dst_len - pos)
+ goto done;
if (crypto_memneq(out_buf + pos, digest_info->data,
digest_info->size))
goto done;