* + mm-sparse-fix-kernel-crash-with-pfn_section_valid-check-v2.patch added to -mm tree
@ 2020-03-26 19:41 akpm
0 siblings, 0 replies; only message in thread
From: akpm @ 2020-03-26 19:41 UTC (permalink / raw)
To: aneesh.kumar, bhe, dan.j.williams, david, mhocko, mm-commits,
mpe, osalvador, pankaj.gupta.linux, richardw.yang, rppt, sachinp,
stable
The patch titled
Subject: mm-sparse-fix-kernel-crash-with-pfn_section_valid-check-v2
has been added to the -mm tree. Its filename is
mm-sparse-fix-kernel-crash-with-pfn_section_valid-check-v2.patch
This patch should soon appear at
http://ozlabs.org/~akpm/mmots/broken-out/mm-sparse-fix-kernel-crash-with-pfn_section_valid-check-v2.patch
and later at
http://ozlabs.org/~akpm/mmotm/broken-out/mm-sparse-fix-kernel-crash-with-pfn_section_valid-check-v2.patch
Before you just go and hit "reply", please:
a) Consider who else should be cc'ed
b) Prefer to cc a suitable mailing list as well
c) Ideally: find the original patch on the mailing list and do a
reply-to-all to that, adding suitable additional cc's
*** Remember to use Documentation/process/submit-checklist.rst when testing your code ***
The -mm tree is included into linux-next and is updated
there every 3-4 working days
------------------------------------------------------
From: "Aneesh Kumar K.V" <aneesh.kumar@linux.ibm.com>
Subject: mm-sparse-fix-kernel-crash-with-pfn_section_valid-check-v2
add comment
Link: http://lkml.kernel.org/r/20200326133235.343616-1-aneesh.kumar@linux.ibm.com
Fixes: d41e2f3bd546 ("mm/hotplug: fix hot remove failure in SPARSEMEM|!VMEMMAP case")
Signed-off-by: Aneesh Kumar K.V <aneesh.kumar@linux.ibm.com>
Reported-by: Sachin Sant <sachinp@linux.vnet.ibm.com>
Tested-by: Sachin Sant <sachinp@linux.vnet.ibm.com>
Reviewed-by: Baoquan He <bhe@redhat.com>
Acked-by: Michal Hocko <mhocko@suse.com>
Acked-by: Pankaj Gupta <pankaj.gupta.linux@gmail.com>
Cc: Michael Ellerman <mpe@ellerman.id.au>
Cc: Dan Williams <dan.j.williams@intel.com>
Cc: David Hildenbrand <david@redhat.com>
Cc: Wei Yang <richardw.yang@linux.intel.com>
Cc: Oscar Salvador <osalvador@suse.de>
Cc: Mike Rapoport <rppt@linux.ibm.com>
Cc: <stable@vger.kernel.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
---
mm/sparse.c | 6 +++++-
1 file changed, 5 insertions(+), 1 deletion(-)
--- a/mm/sparse.c~mm-sparse-fix-kernel-crash-with-pfn_section_valid-check-v2
+++ a/mm/sparse.c
@@ -781,7 +781,11 @@ static void section_deactivate(unsigned
ms->usage = NULL;
}
memmap = sparse_decode_mem_map(ms->section_mem_map, section_nr);
- /* Mark the section invalid */
+ /*
+ * Mark the section invalid so that valid_section()
+ * return false. This prevents code from dereferencing
+ * ms->usage array.
+ */
ms->section_mem_map &= ~SECTION_HAS_MEM_MAP;
}
_
Patches currently in -mm which might be from aneesh.kumar@linux.ibm.com are
mm-sparse-fix-kernel-crash-with-pfn_section_valid-check.patch
mm-sparse-fix-kernel-crash-with-pfn_section_valid-check-v2.patch
^ permalink raw reply [flat|nested] only message in thread
only message in thread, other threads:[~2020-03-26 19:41 UTC | newest]
Thread overview: (only message) (download: mbox.gz / follow: Atom feed)
-- links below jump to the message on this page --
2020-03-26 19:41 + mm-sparse-fix-kernel-crash-with-pfn_section_valid-check-v2.patch added to -mm tree akpm
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox;
as well as URLs for NNTP newsgroup(s).