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authorHugh Dickins <hughd@google.com>2017-06-20 02:10:44 -0700
committerLinus Torvalds <torvalds@linux-foundation.org>2017-06-21 10:56:11 -0700
commitf4cb767d76cf7ee72f97dd76f6cfa6c76a5edc89 (patch)
tree425524affe25e84c5d1efbf1c5785f3c2c2cce33 /fs/gfs2/glock.h
parent9705596d08ac87c18aee32cc97f2783b7d14624e (diff)
mm: fix new crash in unmapped_area_topdown()
Trinity gets kernel BUG at mm/mmap.c:1963! in about 3 minutes of mmap testing. That's the VM_BUG_ON(gap_end < gap_start) at the end of unmapped_area_topdown(). Linus points out how MAP_FIXED (which does not have to respect our stack guard gap intentions) could result in gap_end below gap_start there. Fix that, and the similar case in its alternative, unmapped_area(). Cc: stable@vger.kernel.org Fixes: 1be7107fbe18 ("mm: larger stack guard gap, between vmas") Reported-by: Dave Jones <davej@codemonkey.org.uk> Debugged-by: Linus Torvalds <torvalds@linux-foundation.org> Signed-off-by: Hugh Dickins <hughd@google.com> Acked-by: Michal Hocko <mhocko@suse.com> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'fs/gfs2/glock.h')
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