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-rw-r--r--block/blk-lib.c5
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);