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crypto: rsa-pkcs1pad - fix buffer overread in pkcs1pad_verify_complete()

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Before checking whether the expected digest_info is present, we need to
check that there are enough bytes remaining.

Fixes: a49de377e0 ("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>
This commit is contained in:
Eric Biggers 2022-01-18 16:13:05 -08:00 committed by Herbert Xu
parent d3481accd9
commit a24611ea35
1 changed files with 2 additions and 0 deletions
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2
crypto/rsa-pkcs1pad.c
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@ -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;