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badblocks: avoid checking invalid range in badblocks_check()

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If prev_badblocks() returns '-1', it means no valid badblocks record
before the checking range. It doesn't make sense to check whether
the input checking range is overlapped with the non-existed invalid
front range.

This patch checkes whether 'prev >= 0' is true before calling
overlap_front(), to void such invalid operations.

Fixes: 3ea3354cb9 ("badblocks: improve badblocks_check() for multiple ranges handling")
Reported-and-tested-by: Ira Weiny <ira.weiny@intel.com>
Signed-off-by: Coly Li <colyli@suse.de>
Link: https://lore.kernel.org/nvdimm/3035e75a-9be0-4bc3-8d4a-6e52c207f277@leemhuis.info/
Cc: Dan Williams <dan.j.williams@intel.com>
Cc: Geliang Tang <geliang.tang@suse.com>
Cc: Hannes Reinecke <hare@suse.de>
Cc: Jens Axboe <axboe@kernel.dk>
Cc: NeilBrown <neilb@suse.de>
Cc: Vishal L Verma <vishal.l.verma@intel.com>
Cc: Xiao Ni <xni@redhat.com>
Link: https://lore.kernel.org/r/20231224002820.20234-1-colyli@suse.de
Signed-off-by: Jens Axboe <axboe@kernel.dk>
This commit is contained in:
Coly Li 2023-12-24 08:28:20 +08:00 committed by Jens Axboe
parent 13d822bf1c
commit 146e843f6b
1 changed files with 4 additions and 2 deletions
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6
block/badblocks.c
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@ -1312,12 +1312,14 @@ static int _badblocks_check(struct badblocks *bb, sector_t s, int sectors,
prev = prev_badblocks(bb, &bad, hint);
/* start after all badblocks */
if ((prev + 1) >= bb->count && !overlap_front(bb, prev, &bad)) {
if ((prev >= 0) &&
((prev + 1) >= bb->count) && !overlap_front(bb, prev, &bad)) {
len = sectors;
goto update_sectors;
}
if (overlap_front(bb, prev, &bad)) {
/* Overlapped with front badblocks record */
if ((prev >= 0) && overlap_front(bb, prev, &bad)) {
if (BB_ACK(p[prev]))
acked_badblocks++;
else