[PATCH] crypto: Prevent kernel-infoleak in rng_recvmsg

[Edward Adam Davis]

Initialize the intermediary array member to 0 to prevent the kernel from
leaking uninitialized data to user space.

Reported-by: syzbot+e8bcd7ee3db6cb5cb875@xxxxxxxxxxxxxxxxxxxxxxxxx
Closes: https://syzkaller.appspot.com/bug?extid=e8bcd7ee3db6cb5cb875
Tested-by: syzbot+e8bcd7ee3db6cb5cb875@xxxxxxxxxxxxxxxxxxxxxxxxx
Signed-off-by: Edward Adam Davis <eadavis@xxxxxx>
---
 crypto/jitterentropy-kcapi.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/crypto/jitterentropy-kcapi.c b/crypto/jitterentropy-kcapi.c
index c24d4ff2b4a8..9e9e069f55af 100644
--- a/crypto/jitterentropy-kcapi.c
+++ b/crypto/jitterentropy-kcapi.c
@@ -107,7 +107,7 @@ int jent_hash_time(void *hash_state, __u64 time, u8 *addtl,
 {
 	struct shash_desc *hash_state_desc = (struct shash_desc *)hash_state;
 	SHASH_DESC_ON_STACK(desc, hash_state_desc->tfm);
-	u8 intermediary[SHA3_256_DIGEST_SIZE];
+	u8 intermediary[SHA3_256_DIGEST_SIZE] = { 0 };
 	__u64 j = 0;
 	int ret;
 
-- 
2.43.0