The patch titled
Subject: mm/page_owner: avoid null pointer dereference
has been added to the -mm tree. Its filename is
mm-page_owner-use-stackdepot-to-store-stacktrace-fix.patch
This patch should soon appear at
http://ozlabs.org/~akpm/mmots/broken-out/mm-page_owner-use-stackdepot-to-store-stacktrace-fix.patch
and later at
http://ozlabs.org/~akpm/mmotm/broken-out/mm-page_owner-use-stackdepot-to-store-stacktrace-fix.patch
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------------------------------------------------------
From: Sudip Mukherjee <sudipm.mukherjee@xxxxxxxxx>
Subject: mm/page_owner: avoid null pointer dereference
We have dereferenced page_ext before checking it. Lets check it first
and then used it.
Link: http://lkml.kernel.org/r/1465249059-7883-1-git-send-email-sudipm.mukherjee@xxxxxxxxx
Signed-off-by: Sudip Mukherjee <sudip.mukherjee@xxxxxxxxxxxxxxx>
Cc: Joonsoo Kim <iamjoonsoo.kim@xxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
mm/page_owner.c | 6 ++++--
1 file changed, 4 insertions(+), 2 deletions(-)
diff -puN mm/page_owner.c~mm-page_owner-use-stackdepot-to-store-stacktrace-fix mm/page_owner.c
--- a/mm/page_owner.c~mm-page_owner-use-stackdepot-to-store-stacktrace-fix
+++ a/mm/page_owner.c
@@ -291,13 +291,15 @@ void __dump_page_owner(struct page *page
.skip = 0
};
depot_stack_handle_t handle;
- gfp_t gfp_mask = page_ext->gfp_mask;
- int mt = gfpflags_to_migratetype(gfp_mask);
+ gfp_t gfp_mask;
+ int mt;
if (unlikely(!page_ext)) {
pr_alert("There is not page extension available.\n");
return;
}
+ gfp_mask = page_ext->gfp_mask;
+ mt = gfpflags_to_migratetype(gfp_mask);
if (!test_bit(PAGE_EXT_OWNER, &page_ext->flags)) {
pr_alert("page_owner info is not active (free page?)\n");
_
Patches currently in -mm which might be from sudipm.mukherjee@xxxxxxxxx are
mm-page_owner-use-stackdepot-to-store-stacktrace-fix.patch
fpga-zynq-fpga-fix-build-failure.patch
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