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Commit 091d0d55 authored by Li Zefan's avatar Li Zefan Committed by Linus Torvalds
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shm: fix null pointer deref when userspace specifies invalid hugepage size



Dave reported an oops triggered by trinity:

  BUG: unable to handle kernel NULL pointer dereference at 0000000000000008
  IP: newseg+0x10d/0x390
  PGD cf8c1067 PUD cf8c2067 PMD 0
  Oops: 0000 [#1] PREEMPT SMP DEBUG_PAGEALLOC
  CPU: 2 PID: 7636 Comm: trinity-child2 Not tainted 3.9.0+#67
  ...
  Call Trace:
    ipcget+0x182/0x380
    SyS_shmget+0x5a/0x60
    tracesys+0xdd/0xe2

This bug was introduced by commit af73e4d9 ("hugetlbfs: fix mmap
failure in unaligned size request").

Reported-by: default avatarDave Jones <davej@redhat.com>
Cc: <stable@vger.kernel.org>
Signed-off-by: default avatarLi Zefan <lizfan@huawei.com>
Reviewed-by: default avatarNaoya Horiguchi <n-horiguchi@ah.jp.nec.com>
Acked-by: default avatarRik van Riel <riel@redhat.com>
Signed-off-by: default avatarLinus Torvalds <torvalds@linux-foundation.org>
parent de2657f9
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