crypto: gcm - Fix IV buffer size in crypto_gcm_setkey

commit 50d2e6dc1f83db0563c7d6603967bf9585ce934b upstream.

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>
Signed-off-by: Ben Hutchings <ben@decadent.org.uk>

diff --git a/crypto/gcm.c b/crypto/gcm.c
index 9e47c4d..dd3bf30 100644 (file)
--- a/crypto/gcm.c
+++ b/crypto/gcm.c
@@ -103,7 +103,7 @@ static int crypto_gcm_setkey(struct crypto_aead *aead, const u8 *key,
        struct crypto_ablkcipher *ctr = ctx->ctr;
        struct {
                be128 hash;
        struct crypto_ablkcipher *ctr = ctx->ctr;
        struct {
                be128 hash;

-               u8 iv[8];
+               u8 iv[16];

 
                struct crypto_gcm_setkey_result result;
 
 
                struct crypto_gcm_setkey_result result;