https://github.com/torvalds/linux
Revision 457a98b0809fa6cde7aab8c314a59d99772b445e authored by Hugh Dickins on 17 February 2016, 21:11:23 UTC, committed by Linus Torvalds on 19 February 2016, 00:23:24 UTC
Commit 3565fce3a659 ("mm, x86: get_user_pages() for dax mappings") has
moved up the pte_page(pte) in x86's fast gup_pte_range(), for no
discernible reason: put it back where it belongs, after the pte_flags
check and the pfn_valid cross-check.
That may be the cause of the NULL pointer dereference in
gup_pte_range(), seen when vfio called vaddr_get_pfn() when starting a
qemu-kvm based VM.
Signed-off-by: Hugh Dickins <hughd@google.com>
Reported-by: Michael Long <Harn-Solo@gmx.de>
Tested-by: Michael Long <Harn-Solo@gmx.de>
Acked-by: Dan Williams <dan.j.williams@intel.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
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Tip revision: 457a98b0809fa6cde7aab8c314a59d99772b445e authored by Hugh Dickins on 17 February 2016, 21:11:23 UTC
mm, x86: fix pte_page() crash in gup_pte_range()
mm, x86: fix pte_page() crash in gup_pte_range()
Tip revision: 457a98b
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| .get_maintainer.ignore | -rw-r--r-- | 31 bytes |
| .gitignore | -rw-r--r-- | 1.2 KB |
| .mailmap | -rw-r--r-- | 5.5 KB |
| COPYING | -rw-r--r-- | 18.3 KB |
| CREDITS | -rw-r--r-- | 95.4 KB |
| Kbuild | -rw-r--r-- | 2.6 KB |
| Kconfig | -rw-r--r-- | 252 bytes |
| MAINTAINERS | -rw-r--r-- | 337.0 KB |
| Makefile | -rw-r--r-- | 53.7 KB |
| README | -rw-r--r-- | 18.2 KB |
| REPORTING-BUGS | -rw-r--r-- | 7.3 KB |
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