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mm/hugetlb.c: fix error-path memory leak in nr_hugepages_store_common() 

The NODEMASK_ALLOC macro may dynamically allocate memory for its second
argument ('nodes_allowed' in this context).

In nr_hugepages_store_common() we may abort early if strict_strtoul()
fails, but in that case we do not free the memory already allocated to
'nodes_allowed', causing a memory leak.

This patch closes the leak by freeing the memory in the error path.

[akpm@linux-foundation.org: use NODEMASK_FREE, per Minchan Kim]
Signed-off-by: Jesper Juhl <jj@chaosbits.net>
Cc: Minchan Kim <minchan.kim@gmail.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Jesper Juhl 2011-01-13 15:47:22 -08:00 committed by Linus Torvalds
parent 29c1f677d4
commit 32d6feadf4
1 changed files with 3 additions and 1 deletions
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4
mm/hugetlb.c
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@ -1374,8 +1374,10 @@ static ssize_t nr_hugepages_store_common(bool obey_mempolicy,
NODEMASK_ALLOC(nodemask_t, nodes_allowed, GFP_KERNEL | __GFP_NORETRY);
err = strict_strtoul(buf, 10, &count);
if (err)
if (err) {
NODEMASK_FREE(nodes_allowed);
return 0;
}
h = kobj_to_hstate(kobj, &nid);
if (nid == NUMA_NO_NODE) {