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linux/mm
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Dave Hansen 4523e14585 mm: fix vma_resv_map() NULL pointer 
hugetlb_reserve_pages() can be used for either normal file-backed
hugetlbfs mappings, or MAP_HUGETLB.  In the MAP_HUGETLB, semi-anonymous
mode, there is not a VMA around.  The new call to resv_map_put() assumed
that there was, and resulted in a NULL pointer dereference:

  BUG: unable to handle kernel NULL pointer dereference at 0000000000000030
  IP: vma_resv_map+0x9/0x30
  PGD 141453067 PUD 1421e1067 PMD 0
  Oops: 0000 [#1] PREEMPT SMP
  ...
  Pid: 14006, comm: trinity-child6 Not tainted 3.4.0+ #36
  RIP: vma_resv_map+0x9/0x30
  ...
  Process trinity-child6 (pid: 14006, threadinfo ffff8801414e0000, task ffff8801414f26b0)
  Call Trace:
    resv_map_put+0xe/0x40
    hugetlb_reserve_pages+0xa6/0x1d0
    hugetlb_file_setup+0x102/0x2c0
    newseg+0x115/0x360
    ipcget+0x1ce/0x310
    sys_shmget+0x5a/0x60
    system_call_fastpath+0x16/0x1b

This was reported by Dave Jones, but was reproducible with the
libhugetlbfs test cases, so shame on me for not running them in the
first place.

With this, the oops is gone, and the output of libhugetlbfs's
run_tests.py is identical to plain 3.4 again.

[ Marked for stable, since this was introduced by commit c50ac05081
  ("hugetlb: fix resv_map leak in error path") which was also marked for
  stable ]

Reported-by: Dave Jones <davej@redhat.com>
Cc: Mel Gorman <mel@csn.ul.ie>
Cc: KOSAKI Motohiro <kosaki.motohiro@jp.fujitsu.com>
Cc: Christoph Lameter <cl@linux.com>
Cc: Andrea Arcangeli <aarcange@redhat.com>
Cc: Andrew Morton <akpm@linux-foundation.org>
Cc: <stable@vger.kernel.org>        [2.6.32+]
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2012-05-30 08:48:13 -07:00
..
backing-dev.c backing-dev: fix wakeup timer races with bdi_unregister() 2012-02-01 16:52:49 +08:00
bootmem.c mm/bootmem.c: cleanup on addition to bootmem data list 2012-05-29 16:22:24 -07:00
bounce.c mm: remove the second argument of k[un]map_atomic() 2012-03-20 21:48:27 +08:00
cleancache.c mm: cleancache: Use __read_mostly as appropiate. 2012-01-23 16:08:09 -05:00
compaction.c mm/memcg: apply add/del_page to lruvec 2012-05-29 16:22:28 -07:00
debug-pagealloc.c mm, x86: Remove debug_pagealloc_enabled 2011-12-06 09:24:07 +01:00
dmapool.c mm: fix implicit stat.h usage in dmapool.c 2011-10-31 09:20:12 -04:00
fadvise.c fadvise: only initiate writeback for specified range with FADV_DONTNEED 2012-01-10 16:30:43 -08:00
failslab.c switch debugfs to umode_t 2012-01-03 22:54:56 -05:00
filemap_xip.c mm/filemap_xip.c: fix race condition in xip_file_fault() 2012-02-03 16:16:41 -08:00
filemap.c mm: move readahead syscall to mm/readahead.c 2012-05-29 16:22:23 -07:00
fremap.c mm: delete various needless include <linux/module.h> 2011-10-31 09:20:11 -04:00
highmem.c Merge branch 'modsplit-Oct31_2011' of git://git.kernel.org/pub/scm/linux/kernel/git/paulg/linux 2011-11-06 19:44:47 -08:00
huge_memory.c mm/memcg: apply add/del_page to lruvec 2012-05-29 16:22:28 -07:00
hugetlb.c mm: fix vma_resv_map() NULL pointer 2012-05-30 08:48:13 -07:00
hwpoison-inject.c HWPOISON: Clean up memory_failure() vs. __memory_failure() 2012-01-03 12:06:32 -08:00
init-mm.c atomic: use <linux/atomic.h> 2011-07-26 16:49:47 -07:00
internal.h mm: compaction: handle incorrect MIGRATE_UNMOVABLE type pageblocks 2012-05-29 16:22:22 -07:00
Kconfig Cross Memory Attach: make it Kconfigurable 2012-05-29 16:22:20 -07:00
Kconfig.debug mm: more intensive memory corruption debugging 2012-01-10 16:30:42 -08:00
kmemcheck.c
kmemleak-test.c kmemleak: remove memset by using kzalloc 2011-01-27 18:31:51 +00:00
kmemleak.c kmemleak: Disable early logging when kmemleak is off by default 2012-01-20 16:57:05 +00:00
ksm.c ksm: cleanup: introduce find_mergeable_vma() 2012-03-21 17:54:59 -07:00
maccess.c mm: Map most files to use export.h instead of module.h 2011-10-31 09:20:12 -04:00
madvise.c mm/fs: route MADV_REMOVE to FALLOC_FL_PUNCH_HOLE 2012-05-29 16:22:22 -07:00
Makefile Cross Memory Attach: make it Kconfigurable 2012-05-29 16:22:20 -07:00
memblock.c mm/memblock: fix memory leak on extending regions 2012-05-29 16:22:24 -07:00
memcontrol.c memcg: decrement static keys at real destroy time 2012-05-29 16:22:28 -07:00
memory_hotplug.c mm: print physical addresses consistently with other parts of kernel 2012-05-29 16:22:21 -07:00
memory-failure.c mm/memory_failure: let the compiler add the function name 2012-05-29 16:22:18 -07:00
memory.c thp, memcg: split hugepage for memcg oom on cow 2012-05-29 16:22:19 -07:00
mempolicy.c mm: do_migrate_pages(): rename arguments 2012-05-29 16:22:20 -07:00
mempool.c mempool: fix first round failure behavior 2012-01-10 16:30:45 -08:00
migrate.c Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/ebiederm/user-namespace 2012-05-23 17:42:39 -07:00
mincore.c mm: thp: fix pmd_bad() triggering in code paths holding mmap_sem read mode 2012-03-21 17:54:54 -07:00
mlock.c vm: avoid using find_vma_prev() unnecessarily 2012-03-06 18:23:36 -08:00
mm_init.c mm: Map most files to use export.h instead of module.h 2011-10-31 09:20:12 -04:00
mmap.c mm/mmap.c: find_vma(): remove unnecessary if(mm) check 2012-05-29 16:22:19 -07:00
mmu_context.c mm, counters: remove task argument to sync_mm_rss() and __sync_task_rss_stat() 2012-03-21 17:54:59 -07:00
mmu_notifier.c mm: Map most files to use export.h instead of module.h 2011-10-31 09:20:12 -04:00
mmzone.c mm: add link from struct lruvec to struct zone 2012-05-29 16:22:26 -07:00
mprotect.c Merge branch 'akpm' (Andrew's patch-bomb) 2012-03-22 09:04:48 -07:00
mremap.c mm: collapse security_vm_enough_memory() variants into a single function 2012-02-14 10:45:39 +11:00
msync.c sanitize vfs_fsync calling conventions 2010-05-21 18:31:21 -04:00
nobootmem.c mm: remove sparsemem allocation details from the bootmem allocator 2012-05-29 16:22:22 -07:00
nommu.c kill mm argument of vm_munmap() 2012-04-21 01:58:20 -04:00
oom_kill.c mm, oom: normalize oom scores to oom_score_adj scale only for userspace 2012-05-29 16:22:24 -07:00
page_alloc.c mm: add link from struct lruvec to struct zone 2012-05-29 16:22:26 -07:00
page_cgroup.c page_cgroup: fix horrid swap accounting regression 2012-03-06 08:18:23 -08:00
page_io.c block: kill off REQ_UNPLUG 2011-03-10 08:52:27 +01:00
page_isolation.c mm: page_isolation: MIGRATE_CMA isolation functions added 2012-05-21 15:09:33 +02:00
page-writeback.c writeback: initialize global_dirty_limit 2012-05-06 13:41:58 +08:00
pagewalk.c mm: thp: fix pmd_bad() triggering in code paths holding mmap_sem read mode 2012-03-21 17:54:54 -07:00
percpu-km.c percpu: clear memory allocated with the km allocator 2010-10-02 10:28:42 +03:00
percpu-vm.c percpu: use bitmap_clear 2012-01-20 09:23:16 -08:00
percpu.c kmemleak: Fix the kmemleak tracking of the percpu areas with !SMP 2012-05-09 10:13:29 -07:00
pgtable-generic.c arch/tile: allow building Linux with transparent huge pages enabled 2012-05-25 12:48:21 -04:00
prio_tree.c sanitize <linux/prefetch.h> usage 2011-05-20 12:50:29 -07:00
process_vm_access.c Fix race in process_vm_rw_core 2012-02-02 12:55:17 -08:00
quicklist.c mm: delete various needless include <linux/module.h> 2011-10-31 09:20:11 -04:00
readahead.c mm: move readahead syscall to mm/readahead.c 2012-05-29 16:22:23 -07:00
rmap.c mm: remove swap token code 2012-05-29 16:22:19 -07:00
shmem.c tmpfs: support SEEK_DATA and SEEK_HOLE 2012-05-29 16:22:23 -07:00
slab.c Merge branch 'slab/for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/penberg/linux 2012-03-28 15:04:26 -07:00
slob.c mm: Map most files to use export.h instead of module.h 2011-10-31 09:20:12 -04:00
slub.c slub: missing test for partial pages flush work in flush_all() 2012-05-17 18:00:51 -07:00
sparse-vmemmap.c mm: delete various needless include <linux/module.h> 2011-10-31 09:20:11 -04:00
sparse.c mm: remove sparsemem allocation details from the bootmem allocator 2012-05-29 16:22:22 -07:00
swap_state.c mm: fix s390 BUG by __set_page_dirty_no_writeback on swap 2012-04-23 18:19:22 -07:00
swap.c mm/memcg: apply add/del_page to lruvec 2012-05-29 16:22:28 -07:00
swapfile.c memcg: fix/change behavior of shared anon at moving task 2012-05-29 16:22:24 -07:00
truncate.c mm/fs: remove truncate_range 2012-05-29 16:22:23 -07:00
util.c procfs: mark thread stack correctly in proc/<pid>/maps 2012-03-21 17:54:58 -07:00
vmalloc.c mm: fix faulty initialization in vmalloc_init() 2012-05-29 16:22:24 -07:00
vmscan.c mm/memcg: apply add/del_page to lruvec 2012-05-29 16:22:28 -07:00
vmstat.c mm/vmstat.c: remove debug fs entries on failure of file creation and made extfrag_debug_root dentry local 2012-05-29 16:22:19 -07:00