diff options
| -rw-r--r-- | block/blk-lib.c | 5 |
1 files changed, 4 insertions, 1 deletions
diff --git a/block/blk-lib.c b/block/blk-lib.c index 78e627e2581..64974b1c7cc 100644 --- a/block/blk-lib.c +++ b/block/blk-lib.c @@ -59,7 +59,10 @@ int blkdev_issue_discard(struct block_device *bdev, sector_t sector, * granularity */ max_discard_sectors = min(q->limits.max_discard_sectors, UINT_MAX >> 9); - if (q->limits.discard_granularity) { + if (!unlikely(!max_discard_sectors)) { + /* Avoid infinite loop below. Being cautious never hurts. */ + return -EOPNOTSUPP; + } else if (q->limits.discard_granularity) { unsigned int disc_sects = q->limits.discard_granularity >> 9; max_discard_sectors &= ~(disc_sects - 1); |