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forked fromtorvalds/linux

Commit8970a63

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Yisheng Xietorvalds
Yisheng Xie
authored andcommitted
mm/mempolicy.c: avoid use uninitialized preferred_node
Alexander reported a use of uninitialized memory in __mpol_equal(),which is caused by incorrect use of preferred_node.When mempolicy in mode MPOL_PREFERRED with flags MPOL_F_LOCAL, it usesnuma_node_id() instead of preferred_node, however, __mpol_equal() usespreferred_node without checking whether it is MPOL_F_LOCAL or not.[akpm@linux-foundation.org: slight comment tweak]Link:http://lkml.kernel.org/r/4ebee1c2-57f6-bcb8-0e2d-1833d1ee0bb7@huawei.comFixes:fc36b8d ("mempolicy: use MPOL_F_LOCAL to Indicate Preferred Local Policy")Signed-off-by: Yisheng Xie <xieyisheng1@huawei.com>Reported-by: Alexander Potapenko <glider@google.com>Tested-by: Alexander Potapenko <glider@google.com>Reviewed-by: Andrew Morton <akpm@linux-foundation.org>Cc: Dmitriy Vyukov <dvyukov@google.com>Cc: Vlastimil Babka <vbabka@suse.cz>Cc: Michal Hocko <mhocko@kernel.org>Signed-off-by: Andrew Morton <akpm@linux-foundation.org>Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
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‎mm/mempolicy.c‎

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Original file line numberDiff line numberDiff line change
@@ -2124,6 +2124,9 @@ bool __mpol_equal(struct mempolicy *a, struct mempolicy *b)
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caseMPOL_INTERLEAVE:
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return !!nodes_equal(a->v.nodes,b->v.nodes);
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caseMPOL_PREFERRED:
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/* a's ->flags is the same as b's */
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if (a->flags&MPOL_F_LOCAL)
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return true;
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returna->v.preferred_node==b->v.preferred_node;
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default:
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BUG();

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