The patch titled
Subject: kasan: avoid -Wmaybe-uninitialized warning
has been removed from the -mm tree. Its filename was
kasan-avoid-wmaybe-uninitialized-warning.patch
This patch was dropped because an updated version will be merged
------------------------------------------------------
From: Arnd Bergmann <arnd@xxxxxxxx>
Subject: kasan: avoid -Wmaybe-uninitialized warning
gcc-7 produces this warning:
mm/kasan/report.c: In function 'kasan_report':
mm/kasan/report.c:351:3: error: 'info.first_bad_addr' may be used uninitialized in this function [-Werror=maybe-uninitialized]
print_shadow_for_address(info->first_bad_addr);
^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
mm/kasan/report.c:360:27: note: 'info.first_bad_addr' was declared here
The code seems fine as we only print info.first_bad_addr when there is a shadow,
and we always initialize it in that case, but this is relatively hard
for gcc to figure out after the latest rework. Adding an intialization
in the other code path gets rid of the warning.
Fixes: b235b9808664 ("kasan: unify report headers")
Link: https://patchwork.kernel.org/patch/9641417/
Link: http://lkml.kernel.org/r/20170721210251.3378996-1-arnd@xxxxxxxx
Signed-off-by: Arnd Bergmann <arnd@xxxxxxxx>
Acked-by: Dmitry Vyukov <dvyukov@xxxxxxxxxx>
Cc: Alexander Potapenko <glider@xxxxxxxxxx>
Cc: Dmitry Vyukov <dvyukov@xxxxxxxxxx>
Cc: Andrey Konovalov <andreyknvl@xxxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
mm/kasan/report.c | 3 +++
1 file changed, 3 insertions(+)
diff -puN mm/kasan/report.c~kasan-avoid-wmaybe-uninitialized-warning mm/kasan/report.c
--- a/mm/kasan/report.c~kasan-avoid-wmaybe-uninitialized-warning
+++ a/mm/kasan/report.c
@@ -111,6 +111,9 @@ static const char *get_wild_bug_type(str
{
const char *bug_type = "unknown-crash";
+ /* shut up spurious -Wmaybe-uninitialized warning */
+ info->first_bad_addr = (void *)(-1ul);
+
if ((unsigned long)info->access_addr < PAGE_SIZE)
bug_type = "null-ptr-deref";
else if ((unsigned long)info->access_addr < TASK_SIZE)
_
Patches currently in -mm which might be from arnd@xxxxxxxx are
kasan-avoid-wmaybe-uninitialized-warning-v3.patch
scsi-megaraid-fix-format-overflow-warning.patch
scsi-mpt3sas-fix-format-overflow-warning.patch
scsi-fusion-fix-string-overflow-warning.patch
scsi-gdth-avoid-buffer-overflow-warning.patch
scsi-fnic-fix-format-string-overflow-warning.patch
scsi-gdth-increase-the-procfs-event-buffer-size.patch
block-dac960-shut-up-format-overflow-warning.patch
fscache-fix-fscache_objlist_show-format-processing.patch
ib-mlx4-fix-sprintf-format-warning.patch
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