+ mm-add-null-check-to-avoid-potential-null-pointer-dereference.patch added to -mm tree

+ mm-add-null-check-to-avoid-potential-null-pointer-dereference.patch added to -mm tree

[akpm]

The patch titled
     Subject: mm/memory_hotplug.c: add NULL check to avoid potential NULL pointer dereference
has been added to the -mm tree.  Its filename is
     mm-add-null-check-to-avoid-potential-null-pointer-dereference.patch

This patch should soon appear at
    http://ozlabs.org/~akpm/mmots/broken-out/mm-add-null-check-to-avoid-potential-null-pointer-dereference.patch
and later at
    http://ozlabs.org/~akpm/mmotm/broken-out/mm-add-null-check-to-avoid-potential-null-pointer-dereference.patch

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------------------------------------------------------
From: "Gustavo A. R. Silva" <garsilva@embeddedor.com>
Subject: mm/memory_hotplug.c: add NULL check to avoid potential NULL pointer dereference

NULL check at line 1226: if (!pgdat), implies that pointer pgdat
might be NULL.

rollback_node_hotadd() dereferences this pointer.  Add NULL check to avoid
a potential NULL pointer dereference.

Addresses-Coverity-ID: 1369133
Link: http://lkml.kernel.org/r/20170530212436.GA6195@embeddedgus
Signed-off-by: Gustavo A. R. Silva <garsilva@embeddedor.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
---

 mm/memory_hotplug.c |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff -puN mm/memory_hotplug.c~mm-add-null-check-to-avoid-potential-null-pointer-dereference mm/memory_hotplug.c
--- a/mm/memory_hotplug.c~mm-add-null-check-to-avoid-potential-null-pointer-dereference
+++ a/mm/memory_hotplug.c
@@ -1273,7 +1273,7 @@ register_fail:
 
 error:
 	/* rollback pgdat allocation and others */
-	if (new_pgdat)
+	if (new_pgdat && pgdat)
 		rollback_node_hotadd(nid, pgdat);
 	memblock_remove(start, size);
 
_

Patches currently in -mm which might be from garsilva@embeddedor.com are

mm-add-null-check-to-avoid-potential-null-pointer-dereference.patch