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[v2] crypto: arm64/sm4 - Fix possible crash in GCM cryption

Message ID 20230130073524.68266-1-tianjia.zhang@linux.alibaba.com (mailing list archive)
State New, archived
Headers show
Series [v2] crypto: arm64/sm4 - Fix possible crash in GCM cryption | expand

Commit Message

Tianjia Zhang Jan. 30, 2023, 7:35 a.m. UTC
When the cryption total length is zero, GCM cryption call
skcipher_walk_done() will cause an unexpected crash, so skip calling
this function to avoid possible crash when the GCM cryption length
is equal to zero.

Fixes: ae1b83c7d572 ("crypto: arm64/sm4 - add CE implementation for GCM mode")
Signed-off-by: Tianjia Zhang <tianjia.zhang@linux.alibaba.com>
 arch/arm64/crypto/sm4-ce-gcm-glue.c | 3 +++
 1 file changed, 3 insertions(+)
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diff --git a/arch/arm64/crypto/sm4-ce-gcm-glue.c b/arch/arm64/crypto/sm4-ce-gcm-glue.c
index c450a2025ca9..29aa7470281d 100644
--- a/arch/arm64/crypto/sm4-ce-gcm-glue.c
+++ b/arch/arm64/crypto/sm4-ce-gcm-glue.c
@@ -178,6 +178,9 @@  static int gcm_crypt(struct aead_request *req, struct skcipher_walk *walk,
+		if (unlikely(!walk->nbytes))
+			break;
 		err = skcipher_walk_done(walk, tail);
 		if (err)
 			return err;