summaryrefslogtreecommitdiff
path: root/mm/slab_common.c
diff options
context:
space:
mode:
authorAndrey Konovalov <andreyknvl@google.com>2018-12-28 11:30:35 +0300
committerLinus Torvalds <torvalds@linux-foundation.org>2018-12-28 23:11:43 +0300
commit772a2fa50ffb2f4282be8436da6e70530a2ac63c (patch)
tree21cc3befe7a9d1e8ccc8dd07ded02f90c3055ad0 /mm/slab_common.c
parent21696c1613244f2ad4e9216c4f6e7804831a992c (diff)
downloadlinux-772a2fa50ffb2f4282be8436da6e70530a2ac63c.tar.xz
kasan, mm: perform untagged pointers comparison in krealloc
The krealloc function checks where the same buffer was reused or a new one allocated by comparing kernel pointers. Tag-based KASAN changes memory tag on the krealloc'ed chunk of memory and therefore also changes the pointer tag of the returned pointer. Therefore we need to perform comparison on untagged (with tags reset) pointers to check whether it's the same memory region or not. Link: http://lkml.kernel.org/r/14f6190d7846186a3506cd66d82446646fe65090.1544099024.git.andreyknvl@google.com Signed-off-by: Andrey Konovalov <andreyknvl@google.com> Reviewed-by: Andrey Ryabinin <aryabinin@virtuozzo.com> Reviewed-by: Dmitry Vyukov <dvyukov@google.com> Cc: Christoph Lameter <cl@linux.com> Cc: Mark Rutland <mark.rutland@arm.com> Cc: Will Deacon <will.deacon@arm.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'mm/slab_common.c')
-rw-r--r--mm/slab_common.c2
1 files changed, 1 insertions, 1 deletions
diff --git a/mm/slab_common.c b/mm/slab_common.c
index a4a82fbdefd4..bc24100682b0 100644
--- a/mm/slab_common.c
+++ b/mm/slab_common.c
@@ -1534,7 +1534,7 @@ void *krealloc(const void *p, size_t new_size, gfp_t flags)
}
ret = __do_krealloc(p, new_size, flags);
- if (ret && p != ret)
+ if (ret && kasan_reset_tag(p) != kasan_reset_tag(ret))
kfree(p);
return ret;