crypto: gcm - Fix IV buffer size in crypto_gcm_setkey

Orabug: 25243093

The cipher block size for GCM is 16 bytes, and thus the CTR transform
used in crypto_gcm_setkey() will also expect a 16-byte IV. However,
the code currently reserves only 8 bytes for the IV, causing
an out-of-bounds access in the CTR transform. This patch fixes
the issue by setting the size of the IV buffer to 16 bytes.

Fixes: 84c911523020 ("[CRYPTO] gcm: Add support for async ciphers")
Signed-off-by: Ondrej Mosnacek <omosnacek@gmail.com>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
(cherry picked from commit 50d2e6dc1f83db0563c7d6603967bf9585ce934b)
Signed-off-by: Ethan Zhao <ethan.zhao@oracle.com>

diff --git a/crypto/gcm.c b/crypto/gcm.c
index 33adbc4a4b51a3b0e0a00d83274c210b6c7dc1aa..b096db3ef11414bb35289b54b5301abf3d618423 100644 (file)
--- a/crypto/gcm.c
+++ b/crypto/gcm.c
@@ -109,7 +109,7 @@ static int crypto_gcm_setkey(struct crypto_aead *aead, const u8 *key,
        struct crypto_ablkcipher *ctr = ctx->ctr;
        struct {
                be128 hash;
-               u8 iv[8];
+               u8 iv[16];
 
                struct crypto_gcm_setkey_result result;