mm/mempolicy: fix !vma in new_vma_page()
BUG_ON(!vma) assumption is introduced by commit 0bf598d863e3 ("mbind:
add BUG_ON(!vma) in new_vma_page()"), however, even if
address = __vma_address(page, vma);
and
vma->start < address < vma->end
page_address_in_vma() may still return -EFAULT because of many other
conditions in it. As a result the while loop in new_vma_page() may end
with vma=NULL.
This patch revert the commit and also fix the potential dereference NULL
pointer reported by Dan.
http://marc.info/?l=linux-mm&m=137689530323257&w=2
kernel BUG at mm/mempolicy.c:1204!
invalid opcode: 0000 [#1] PREEMPT SMP DEBUG_PAGEALLOC
CPU: 3 PID: 7056 Comm: trinity-child3 Not tainted 3.13.0-rc3+ #2
task: ffff8801ca5295d0 ti: ffff88005ab20000 task.ti: ffff88005ab20000
RIP: new_vma_page+0x70/0x90
RSP: 0000:ffff88005ab21db0 EFLAGS: 00010246
RAX: fffffffffffffff2 RBX: 0000000000000000 RCX: 0000000000000000
RDX: 0000000008040075 RSI: ffff8801c3d74600 RDI: ffffea00079a8b80
RBP: ffff88005ab21dc8 R08: 0000000000000004 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000000 R12: fffffffffffffff2
R13: ffffea00079a8b80 R14: 0000000000400000 R15: 0000000000400000
FS: 00007ff49c6f4740(0000) GS:ffff880244e00000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007ff49c68f994 CR3: 000000005a205000 CR4: 00000000001407e0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Stack:
ffffea00079a8b80 ffffea00079a8bc0 ffffea00079a8ba0 ffff88005ab21e50
ffffffff811adc7a 0000000000000000 ffff8801ca5295d0 0000000464e224f8
0000000000000000 0000000000000002 0000000000000000 ffff88020ce75c00
Call Trace:
migrate_pages+0x12a/0x850
SYSC_mbind+0x513/0x6a0
SyS_mbind+0xe/0x10
ia32_do_call+0x13/0x13
Code: 85 c0 75 2f 4c 89 e1 48 89 da 31 f6 bf da 00 02 00 65 44 8b 04 25 08 f7 1c 00 e8 ec fd ff ff 5b 41 5c 41 5d 5d c3 0f 1f 44 00 00 <0f> 0b 66 0f 1f 44 00 00 4c 89 e6 48 89 df ba 01 00 00 00 e8 48
RIP [<ffffffff8119f200>] new_vma_page+0x70/0x90
RSP <ffff88005ab21db0>
Signed-off-by: Wanpeng Li <liwanp@linux.vnet.ibm.com>
Reported-by: Dave Jones <davej@redhat.com>
Reported-by: Sasha Levin <sasha.levin@oracle.com>
Reviewed-by: Naoya Horiguchi <n-horiguchi@ah.jp.nec.com>
Reviewed-by: Bob Liu <bob.liu@oracle.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
1 file changed