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[AUTOSEL,4.14,06/21] crypto: simd - correctly take reqsize of wrapped skcipher into account

Message ID 20181122195452.13520-6-sashal@kernel.org
State New
Headers show
Series None | expand

Commit Message

Sasha Levin Nov. 22, 2018, 7:54 p.m. UTC 
From: Ard Biesheuvel <ard.biesheuvel@linaro.org>


[ Upstream commit 508a1c4df085a547187eed346f1bfe5e381797f1 ]

The simd wrapper's skcipher request context structure consists
of a single subrequest whose size is taken from the subordinate
skcipher. However, in simd_skcipher_init(), the reqsize that is
retrieved is not from the subordinate skcipher but from the
cryptd request structure, whose size is completely unrelated to
the actual wrapped skcipher.

Reported-by: Qian Cai <cai@gmx.us>
Signed-off-by: Ard Biesheuvel <ard.biesheuvel@linaro.org>

Tested-by: Qian Cai <cai@gmx.us>

Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>

Signed-off-by: Sasha Levin <sashal@kernel.org>

---
 crypto/simd.c | 5 +++--
 1 file changed, 3 insertions(+), 2 deletions(-)

-- 
2.17.1
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Patch

diff --git a/crypto/simd.c b/crypto/simd.c
index 88203370a62f..894c62944106 100644
--- a/crypto/simd.c
+++ b/crypto/simd.c
@@ -126,8 +126,9 @@  static int simd_skcipher_init(struct crypto_skcipher *tfm)
 
 	ctx->cryptd_tfm = cryptd_tfm;
 
-	reqsize = sizeof(struct skcipher_request);
-	reqsize += crypto_skcipher_reqsize(&cryptd_tfm->base);
+	reqsize = crypto_skcipher_reqsize(cryptd_skcipher_child(cryptd_tfm));
+	reqsize = max(reqsize, crypto_skcipher_reqsize(&cryptd_tfm->base));
+	reqsize += sizeof(struct skcipher_request);
 
 	crypto_skcipher_set_reqsize(tfm, reqsize);