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author | Libin <huawei.libin@huawei.com> | 2013-09-11 14:20:38 -0700 |
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committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2013-09-26 16:52:48 -0700 |
commit | 85a39b77027438bec7f1a1ebbbc46925d22f7b5c (patch) | |
tree | 872fb378ca7bae36248d717ce8b640700c15b488 /fs | |
parent | 49fa5f65bff58a34362e3a29733cbec7a866871d (diff) | |
download | kernel_samsung_smdk4412-85a39b77027438bec7f1a1ebbbc46925d22f7b5c.zip kernel_samsung_smdk4412-85a39b77027438bec7f1a1ebbbc46925d22f7b5c.tar.gz kernel_samsung_smdk4412-85a39b77027438bec7f1a1ebbbc46925d22f7b5c.tar.bz2 |
mm/huge_memory.c: fix potential NULL pointer dereference
commit a8f531ebc33052642b4bd7b812eedf397108ce64 upstream.
In collapse_huge_page() there is a race window between releasing the
mmap_sem read lock and taking the mmap_sem write lock, so find_vma() may
return NULL. So check the return value to avoid NULL pointer dereference.
collapse_huge_page
khugepaged_alloc_page
up_read(&mm->mmap_sem)
down_write(&mm->mmap_sem)
vma = find_vma(mm, address)
Signed-off-by: Libin <huawei.libin@huawei.com>
Acked-by: Kirill A. Shutemov <kirill.shutemov@linux.intel.com>
Reviewed-by: Wanpeng Li <liwanp@linux.vnet.ibm.com>
Reviewed-by: Michal Hocko <mhocko@suse.cz>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'fs')
0 files changed, 0 insertions, 0 deletions