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| author | Mel Gorman <mgorman@suse.de> | 2011-12-08 14:34:30 -0800 |
|---|---|---|
| committer | Linus Torvalds <torvalds@linux-foundation.org> | 2011-12-09 07:50:29 -0800 |
| commit | 1368edf0647ac112d8cfa6ce47257dc950c50f5c (patch) | |
| tree | 57b8c97689b2db9f22487c1b03a753d350ed657c /mm | |
| parent | d021563888312018ca65681096f62e36c20e63cc (diff) | |
| download | blackbird-op-linux-1368edf0647ac112d8cfa6ce47257dc950c50f5c.tar.gz blackbird-op-linux-1368edf0647ac112d8cfa6ce47257dc950c50f5c.zip | |
mm: vmalloc: check for page allocation failure before vmlist insertion
Commit f5252e00 ("mm: avoid null pointer access in vm_struct via
/proc/vmallocinfo") adds newly allocated vm_structs to the vmlist after
it is fully initialised. Unfortunately, it did not check that
__vmalloc_area_node() successfully populated the area. In the event of
allocation failure, the vmalloc area is freed but the pointer to freed
memory is inserted into the vmlist leading to a a crash later in
get_vmalloc_info().
This patch adds a check for ____vmalloc_area_node() failure within
__vmalloc_node_range. It does not use "goto fail" as in the previous
error path as a warning was already displayed by __vmalloc_area_node()
before it called vfree in its failure path.
Credit goes to Luciano Chavez for doing all the real work of identifying
exactly where the problem was.
Signed-off-by: Mel Gorman <mgorman@suse.de>
Reported-by: Luciano Chavez <lnx1138@linux.vnet.ibm.com>
Tested-by: Luciano Chavez <lnx1138@linux.vnet.ibm.com>
Reviewed-by: Rik van Riel <riel@redhat.com>
Acked-by: David Rientjes <rientjes@google.com>
Cc: <stable@vger.kernel.org> [3.1.x+]
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'mm')
| -rw-r--r-- | mm/vmalloc.c | 2 |
1 files changed, 2 insertions, 0 deletions
diff --git a/mm/vmalloc.c b/mm/vmalloc.c index 3231bf332878..1d8b32f07139 100644 --- a/mm/vmalloc.c +++ b/mm/vmalloc.c @@ -1633,6 +1633,8 @@ void *__vmalloc_node_range(unsigned long size, unsigned long align, goto fail; addr = __vmalloc_area_node(area, gfp_mask, prot, node, caller); + if (!addr) + return NULL; /* * In this function, newly allocated vm_struct is not added |
