From: Liang Ma <liang.j.ma@intel.com>
Date: Wed, 24 Jan 2018 15:05:51 +0000 (+0000)
Subject: event/opdl: fix dereference before null check
X-Git-Url: http://git.droids-corp.org/?p=dpdk.git;a=commitdiff_plain;h=8545289a2912bdfab2c4ddf6cc5e134f72677b13

event/opdl: fix dereference before null check

Coverity issue: 257022
Fixes: 4236ce9bf5bf ("event/opdl: add OPDL ring infrastructure library")

Signed-off-by: Liang Ma <liang.j.ma@intel.com>
---

diff --git a/drivers/event/opdl/opdl_ring.c b/drivers/event/opdl/opdl_ring.c
index 7e16d4df1b..39dc41da96 100644
--- a/drivers/event/opdl/opdl_ring.c
+++ b/drivers/event/opdl/opdl_ring.c
@@ -550,6 +550,10 @@ opdl_stage_claim_multithread(struct opdl_stage *s, void *entries,
 	uint32_t i = 0, offset;
 	uint8_t *entries_offset = (uint8_t *)entries;
 
+	if (seq == NULL) {
+		PMD_DRV_LOG(ERR, "Invalid seq PTR");
+		return 0;
+	}
 	offset = opdl_first_entry_id(*seq, s->nb_instance, s->instance_id);
 	num_entries = offset + (s->nb_instance * num_entries);
 
@@ -561,8 +565,8 @@ opdl_stage_claim_multithread(struct opdl_stage *s, void *entries,
 		entries_offset += t->slot_size;
 		i++;
 	}
-	if (seq != NULL)
-		*seq = old_head;
+
+	*seq = old_head;
 
 	return i;
 }