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@xxxxxxxxxxxxxxxxx>
---
arch/arm64/crypto/sm4-ce-gcm-glue.c | 12 +++++++-----
1 file changed, 7 insertions(+), 5 deletions(-)
diff --git a/arch/arm64/crypto/sm4-ce-gcm-glue.c b/arch/arm64/crypto/sm4-ce-gcm-glue.c
index c450a2025ca9..9b63bcf9aa85 100644
--- a/arch/arm64/crypto/sm4-ce-gcm-glue.c
+++ b/arch/arm64/crypto/sm4-ce-gcm-glue.c
@@ -178,11 +178,13 @@ static int gcm_crypt(struct aead_request *req, struct skcipher_walk *walk,
kernel_neon_end();
- err = skcipher_walk_done(walk, tail);
- if (err)
- return err;
- if (walk->nbytes)
- kernel_neon_begin();
+ if (walk->nbytes) {
+ err = skcipher_walk_done(walk, tail);
+ if (err)
+ return err;
+ if (walk->nbytes)
+ kernel_neon_begin();
+ }
} while (walk->nbytes > 0);
return 0;
--
2.24.3 (Apple Git-128)
