[PATCH 5.2 012/144] crypto: ccp - Fix oops by properly managing allocated structures

[Greg Kroah-Hartman]

From: Gary R Hook <gary.hook@xxxxxxx>

commit 25e44338321af545ab34243a6081c3f0fc6107d0 upstream.

A plaintext or ciphertext length of 0 is allowed in AES, in which case
no encryption occurs. Ensure that we don't clean up data structures
that were never allocated.

Fixes: 36cf515b9bbe2 ("crypto: ccp - Enable support for AES GCM on v5 CCPs")
Cc: <stable@xxxxxxxxxxxxxxx>
Signed-off-by: Gary R Hook <gary.hook@xxxxxxx>
Signed-off-by: Herbert Xu <herbert@xxxxxxxxxxxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>

---
 drivers/crypto/ccp/ccp-ops.c |    4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

--- a/drivers/crypto/ccp/ccp-ops.c
+++ b/drivers/crypto/ccp/ccp-ops.c
@@ -859,11 +859,11 @@ e_tag:
 	ccp_dm_free(&final_wa);
 
 e_dst:
-	if (aes->src_len && !in_place)
+	if (ilen > 0 && !in_place)
 		ccp_free_data(&dst, cmd_q);
 
 e_src:
-	if (aes->src_len)
+	if (ilen > 0)
 		ccp_free_data(&src, cmd_q);
 
 e_aad: