diff options
author | Yisheng Xie <xieyisheng1@huawei.com> | 2018-03-22 16:17:02 -0700 |
---|---|---|
committer | Ben Hutchings <ben@decadent.org.uk> | 2018-06-01 00:30:24 +0100 |
commit | c218eb3152efa5b424e3c6951d6796a357a45f05 (patch) | |
tree | 77ec4d4b711635204fe1b51687f804f11272d87e | |
parent | s390/qeth: free netdevice when removing a card (diff) | |
download | linux-stable-c218eb3152efa5b424e3c6951d6796a357a45f05.tar.xz linux-stable-c218eb3152efa5b424e3c6951d6796a357a45f05.zip |
mm/mempolicy.c: avoid use uninitialized preferred_node
commit 8970a63e965b43288c4f5f40efbc2bbf80de7f16 upstream.
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 uses
numa_node_id() instead of preferred_node, however, __mpol_equal() uses
preferred_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.com
Fixes: fc36b8d3d819 ("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>
Signed-off-by: Ben Hutchings <ben@decadent.org.uk>
-rw-r--r-- | mm/mempolicy.c | 3 |
1 files changed, 3 insertions, 0 deletions
diff --git a/mm/mempolicy.c b/mm/mempolicy.c index 1ea67ad062db..b056dc2f73da 100644 --- a/mm/mempolicy.c +++ b/mm/mempolicy.c @@ -2019,6 +2019,9 @@ int __mpol_equal(struct mempolicy *a, struct mempolicy *b) case MPOL_INTERLEAVE: return nodes_equal(a->v.nodes, b->v.nodes); case MPOL_PREFERRED: + /* a's ->flags is the same as b's */ + if (a->flags & MPOL_F_LOCAL) + return true; return a->v.preferred_node == b->v.preferred_node; default: BUG(); |