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ANDROID: mm/slub: Fix Kasan issue with for_each_object_track

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In for_each_object_track we go through meta data of the slab
object in function(fn), and as a result false postive out-of-bound
access is reported by kasan. Fix this by wrapping that function call
with metadata_access_enable/disable.

Bug: 222651868
Fixes: ee8d2c7884 ("ANDROID: mm: add get_each_object_track function")
Change-Id: Ifb4241a9c3e397a52759d467aa267d1297e297dd
Signed-off-by: Vijayanand Jitta <quic_vjitta@quicinc.com>
(cherry picked from commit cd6e5d5d7d)
This commit is contained in:
Vijayanand Jitta
2022-03-04 19:49:08 +05:30
committed by Suren Baghdasaryan
parent ec0a6ef36e
commit 0e00d7c46b
1 changed files with 2 additions and 0 deletions
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2
mm/slub.c
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@@ -705,7 +705,9 @@ unsigned long get_each_object_track(struct kmem_cache *s,
slab_lock(page, &flags);
for_each_object(p, s, page_address(page), page->objects) {
t = get_track(s, p, alloc);
metadata_access_enable();
ret = fn(s, p, t, private);
metadata_access_disable();
if (ret < 0)
break;
num_track += 1;