[PATCH v2] crypto/ipsec_mb: fix Null ptr dereference in set_mb_job_params()

[Konyukhov Aleksandr]

In function set_mb_job_params pmd_aesni_mb.c:1742 check
(cipher_mode == IMB_CIPHER_NULL && oop)
is not enath to garanteed job->dst != 0, which in turn could lead to
NULL ptr dereference.

Add new check for (sgl == 0) to be shure that job->dst
was set in pmd_aesni_mb.c:1610

Found by Linux Verification Center (linuxtesting.org) with SVACE.

Fixes: 03944ff5e3df ("crypto/ipsec_mb: support null auth/cipher for aesni_mb")
Cc: roy.fan.zhang at intel.com

Signed-off-by: Konyukhov Aleksandr <Alexander.Konyukhov at kaspersky.com>
---
 drivers/crypto/ipsec_mb/pmd_aesni_mb.c | 10 +++++++---
 1 file changed, 7 insertions(+), 3 deletions(-)

diff --git a/drivers/crypto/ipsec_mb/pmd_aesni_mb.c b/drivers/crypto/ipsec_mb/pmd_aesni_mb.c
index 05dc1a039f..e3a53d9a14 100644
--- a/drivers/crypto/ipsec_mb/pmd_aesni_mb.c
+++ b/drivers/crypto/ipsec_mb/pmd_aesni_mb.c
@@ -1739,9 +1739,13 @@ set_mb_job_params(IMB_JOB *job, struct ipsec_mb_qp *qp,
 	}
 
 	if (cipher_mode == IMB_CIPHER_NULL && oop) {
-		memcpy(job->dst + job->cipher_start_src_offset_in_bytes,
-			job->src + job->cipher_start_src_offset_in_bytes,
-			job->msg_len_to_cipher_in_bytes);
+		if (!sgl) {
+			memcpy(job->dst + job->cipher_start_src_offset_in_bytes,
+				job->src + job->cipher_start_src_offset_in_bytes,
+				job->msg_len_to_cipher_in_bytes);
+		} else {
+			return -1;
+		}
 	}
 
 	/* Set user data to be crypto operation data struct */
-- 
2.43.0