Commit 50d2e6dc authored Sep 23, 2016 by Ondrej Mosnáček Committed by Herbert Xu Oct 02, 2016

crypto: gcm - Fix IV buffer size in crypto_gcm_setkey



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: 84c91152 ("[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>

parent 5ecf8ef9

crypto/gcm.c

+1 −1

Original line number	Diff line number	Diff line
		@@ -117,7 +117,7 @@ static int crypto_gcm_setkey(struct crypto_aead aead, const u8 key,
		struct crypto_skcipher *ctr = ctx->ctr;
		struct {
		be128 hash;
		u8 iv[8];
		u8 iv[16];

		struct crypto_gcm_setkey_result result;