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| author | Shaurya Rane <ssrane_b23@ee.vjti.ac.in> | 2025-12-04 23:42:59 +0530 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2025-12-18 14:03:36 +0100 |
| commit | 7193407bc4457212fa38ec3aff9c640e63a8dbef (patch) | |
| tree | d3defc56ae178c8214b736ed64864034b524a333 /block | |
| parent | 2864db01b3e54ae441b15bfb65f342e69e51140b (diff) | |
| download | linux-7193407bc4457212fa38ec3aff9c640e63a8dbef.tar.gz linux-7193407bc4457212fa38ec3aff9c640e63a8dbef.tar.bz2 linux-7193407bc4457212fa38ec3aff9c640e63a8dbef.zip | |
block: fix memory leak in __blkdev_issue_zero_pages
[ Upstream commit f7e3f852a42d7cd8f1af2c330d9d153e30c8adcf ]
Move the fatal signal check before bio_alloc() to prevent a memory
leak when BLKDEV_ZERO_KILLABLE is set and a fatal signal is pending.
Previously, the bio was allocated before checking for a fatal signal.
If a signal was pending, the code would break out of the loop without
freeing or chaining the just-allocated bio, causing a memory leak.
This matches the pattern already used in __blkdev_issue_write_zeroes()
where the signal check precedes the allocation.
Fixes: bf86bcdb4012 ("blk-lib: check for kill signal in ioctl BLKZEROOUT")
Reported-by: syzbot+527a7e48a3d3d315d862@syzkaller.appspotmail.com
Closes: https://syzkaller.appspot.com/bug?extid=527a7e48a3d3d315d862
Signed-off-by: Shaurya Rane <ssrane_b23@ee.vjti.ac.in>
Reviewed-by: Keith Busch <kbusch@kernel.org>
Tested-by: syzbot+527a7e48a3d3d315d862@syzkaller.appspotmail.com
Signed-off-by: Jens Axboe <axboe@kernel.dk>
Signed-off-by: Sasha Levin <sashal@kernel.org>
Diffstat (limited to 'block')
| -rw-r--r-- | block/blk-lib.c | 6 |
1 files changed, 3 insertions, 3 deletions
diff --git a/block/blk-lib.c b/block/blk-lib.c index 3030a772d3aa..352e3c0f8a7d 100644 --- a/block/blk-lib.c +++ b/block/blk-lib.c @@ -202,13 +202,13 @@ static void __blkdev_issue_zero_pages(struct block_device *bdev, unsigned int nr_vecs = __blkdev_sectors_to_bio_pages(nr_sects); struct bio *bio; - bio = bio_alloc(bdev, nr_vecs, REQ_OP_WRITE, gfp_mask); - bio->bi_iter.bi_sector = sector; - if ((flags & BLKDEV_ZERO_KILLABLE) && fatal_signal_pending(current)) break; + bio = bio_alloc(bdev, nr_vecs, REQ_OP_WRITE, gfp_mask); + bio->bi_iter.bi_sector = sector; + do { unsigned int len; |