From: Wenwen Wang wenwen@cs.uga.edu
[ Upstream commit e7bf90e5afe3aa1d1282c1635a49e17a32c4ecec ]
In bio_integrity_prep(), a kernel buffer is allocated through kmalloc() to hold integrity metadata. Later on, the buffer will be attached to the bio structure through bio_integrity_add_page(), which returns the number of bytes of integrity metadata attached. Due to unexpected situations, bio_integrity_add_page() may return 0. As a result, bio_integrity_prep() needs to be terminated with 'false' returned to indicate this error. However, the allocated kernel buffer is not freed on this execution path, leading to a memory leak.
To fix this issue, free the allocated buffer before returning from bio_integrity_prep().
Reviewed-by: Ming Lei ming.lei@redhat.com Acked-by: Martin K. Petersen martin.petersen@oracle.com Signed-off-by: Wenwen Wang wenwen@cs.uga.edu Signed-off-by: Jens Axboe axboe@kernel.dk Signed-off-by: Sasha Levin sashal@kernel.org --- block/bio-integrity.c | 8 ++++++-- 1 file changed, 6 insertions(+), 2 deletions(-)
diff --git a/block/bio-integrity.c b/block/bio-integrity.c index 1b633a3526d4..9a8c96d90cb0 100644 --- a/block/bio-integrity.c +++ b/block/bio-integrity.c @@ -291,8 +291,12 @@ bool bio_integrity_prep(struct bio *bio) ret = bio_integrity_add_page(bio, virt_to_page(buf), bytes, offset);
- if (ret == 0) - return false; + if (ret == 0) { + printk(KERN_ERR "could not attach integrity payload\n"); + kfree(buf); + status = BLK_STS_RESOURCE; + goto err_end_io; + }
if (ret < bytes) break;