Kirill A. Shutemov ee53664bda mm: Fix NULL pointer dereference in madvise(MADV_WILLNEED) support ... Sasha Levin found a NULL pointer dereference that is due to a missing page table lock, which in turn is due to the pmd entry in question being a transparent huge-table entry. The code - introduced in commit 1998cc0489 ("mm: make madvise(MADV_WILLNEED) support swap file prefetch") - correctly checks for this situation using pmd_none_or_trans_huge_or_clear_bad(), but it turns out that that function doesn't work correctly. pmd_none_or_trans_huge_or_clear_bad() expected that pmd_bad() would trigger if the transparent hugepage bit was set, but it doesn't do that if pmd_numa() is also set. Note that the NUMA bit only gets set on real NUMA machines, so people trying to reproduce this on most normal development systems would never actually trigger this. Fix it by removing the very subtle (and subtly incorrect) expectation, and instead just checking pmd_trans_huge() explicitly. Reported-by: Sasha Levin <sasha.levin@oracle.com> Acked-by: Andrea Arcangeli <aarcange@redhat.com> [ Additionally remove the now stale test for pmd_trans_huge() inside the pmd_bad() case - Linus ] Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>		2013-12-20 12:17:03 -08:00
..
acpi	Merge branch 'acpica'	2013-11-27 01:03:27 +01:00
asm-generic	mm: Fix NULL pointer dereference in madvise(MADV_WILLNEED) support	2013-12-20 12:17:03 -08:00
clocksource
crypto	crypto: scatterwalk - Use sg_chain_ptr on chain entries	2013-12-09 19:58:52 +08:00
drm	Merge branch 'ttm-fixes-3.13' of git://people.freedesktop.org/~thomash/linux into drm-fixes	2013-11-21 18:46:56 +10:00
dt-bindings	For the 3.13 merge window we have a couple of new drivers for the AMS	2013-11-15 16:37:40 -08:00
keys
kvm
linux	mm: numa: guarantee that tlb_flush_pending updates are visible before page table updates	2013-12-18 19:04:51 -08:00
math-emu
media	[media] videobuf2: Add support for file access mode flags for DMABUF exporting	2013-12-09 14:50:50 -02:00
memory
misc
net	sctp: properly latch and use autoclose value from sock to association	2013-12-10 22:41:26 -05:00
pcmcia
ras
rdma	Merge branches 'cma', 'cxgb4', 'flowsteer', 'ipoib', 'misc', 'mlx4', 'mlx5', 'nes', 'ocrdma', 'qib' and 'srp' into for-next	2013-11-17 08:22:19 -08:00
rxrpc
scsi	[SCSI] Disable WRITE SAME for RAID and virtual host adapter drivers	2013-11-29 08:48:39 +04:00
sound	ALSA: memalloc.h - fix wrong truncation of dma_addr_t	2013-12-10 15:30:46 +01:00
target	target_core_alua: Store supported ALUA states	2013-11-20 11:26:37 -08:00
trace	Merge branch 'perf-urgent-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip	2013-12-02 10:13:09 -08:00
uapi	Merge branch 'perf-urgent-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip	2013-12-19 09:10:46 -08:00
video	fbdev changes for 3.13	2013-11-14 14:44:20 +09:00
xen	Bug-fixes:	2013-12-20 09:34:54 -08:00
Kbuild