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mm/memory_hotplug.c: add NULL check to avoid potential NULL pointer dereference 

The 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>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Gustavo A. R. Silva 2017-07-10 15:47:23 -07:00 committed by Linus Torvalds
parent 0622622677
commit dbac61a3f2
1 changed files with 1 additions and 1 deletions
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2
mm/memory_hotplug.c
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@ -1268,7 +1268,7 @@ int __ref add_memory_resource(int nid, struct resource *res, bool online)
error:
/* rollback pgdat allocation and others */
if (new_pgdat)
if (new_pgdat && pgdat)
rollback_node_hotadd(nid, pgdat);
memblock_remove(start, size);