From 10868bfc5ed099a90fbfd2310bc89c299475d94e Mon Sep 17 00:00:00 2001
From: Mohit Agrawal <moagrawa@redhat.com>
Date: Wed, 19 Dec 2018 13:08:01 +0530
Subject: [PATCH 494/495] mem-pool: Resolve crash in mem_pool_destroy

Problem: In the commit c8e58e3a577e70a64df77fe885847285f682d9fb
         change the code in mem_pool_destroy to delete pool->owner
         without validate pool

Solution: To avoid the crash check the pool pointer

(gdb) f 0
921	        LOCK (&pool->ctx->lock);
(gdb) p pool
$1 = (struct mem_pool *) 0x0

Change-Id: I34fdc8974c5c60767a5c26e7d1c9099d398b9722
BUG: 1648893
Signed-off-by: Mohit Agrawal <moagrawa@redhat.com>
Reviewed-on: https://code.engineering.redhat.com/gerrit/159029
Tested-by: RHGS Build Bot <nigelb@redhat.com>
Reviewed-by: Sunil Kumar Heggodu Gopala Acharya <sheggodu@redhat.com>
---
 libglusterfs/src/mem-pool.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/libglusterfs/src/mem-pool.c b/libglusterfs/src/mem-pool.c
index d82a371..76daca9 100644
--- a/libglusterfs/src/mem-pool.c
+++ b/libglusterfs/src/mem-pool.c
@@ -917,6 +917,9 @@ mem_put (void *ptr)
 void
 mem_pool_destroy (struct mem_pool *pool)
 {
+        if (!pool)
+                return;
+
         /* remove this pool from the owner (glusterfs_ctx_t) */
         LOCK (&pool->ctx->lock);
         {
-- 
1.8.3.1