[PATCH v2] crypto/ipsec_mb: do not dequeue ops after flush

[Krzysztof Karas <krzysztof.karas@intel.com>]

Previously it was possible to increment `processed_jobs` to a value
greater than requested `nb_ops`, because after flushing at most
`nb_ops` jobs the while loop continued, so `processed_jobs` could
still be incremented and it was possible for this variable to be
greater than `nb_ops`. If `ops` provided to the function were
only `nb_ops` long, then the `aesni_mb_dequeue_burst()` would
write to the memory outside of `ops` array.

Fixes: b50b8b5b38f8 ("crypto/ipsec_mb: use burst API in AESNI")
Cc: stable@dpdk.org

Signed-off-by: Krzysztof Karas <krzysztof.karas@intel.com>
---

v2:
 * Shortened title to fit in the limit.
 * Changed nb_ops decrementing from 'nb_jobs' to 'i'.

 drivers/crypto/ipsec_mb/pmd_aesni_mb.c | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/drivers/crypto/ipsec_mb/pmd_aesni_mb.c b/drivers/crypto/ipsec_mb/pmd_aesni_mb.c
index 9e298023d7..aa08490e0c 100644
--- a/drivers/crypto/ipsec_mb/pmd_aesni_mb.c
+++ b/drivers/crypto/ipsec_mb/pmd_aesni_mb.c
@@ -2056,7 +2056,7 @@ aesni_mb_dequeue_burst(void *queue_pair, struct rte_crypto_op **ops,
 		uint16_t n = (nb_ops / burst_sz) ?
 			burst_sz : nb_ops;
 
-		while (unlikely((IMB_GET_NEXT_BURST(mb_mgr, n, jobs)) < n)) {
+		if (unlikely((IMB_GET_NEXT_BURST(mb_mgr, n, jobs)) < n)) {
 			/*
 			 * Not enough free jobs in the queue
 			 * Flush n jobs until enough jobs available
@@ -2074,6 +2074,8 @@ aesni_mb_dequeue_burst(void *queue_pair, struct rte_crypto_op **ops,
 					break;
 				}
 			}
+			nb_ops -= i;
+			continue;
 		}
 
 		/*
-- 
2.41.0

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