loop_change_fd() and loop_configure() call loop_check_backing_file()
to validate the new backing file. If validation fails, the reference
acquired by fget() was not dropped, leaking a file reference.
Fix this by calling fput(file) before returning the error.
Cc: stable@vger.kernel.org
Cc: "Markus Elfring"<Markus.Elfring@web.de>
CC: "Yang Erkun" <yangerkun@huawei.com>
Cc: "Ming Lei"<ming.lei@redhat.com>
Cc: "Yu Kuai"<yukuai1@huaweicloud.com>
Fixes: f5c84eff634b ("loop: Add sanity check for read/write_iter")
Signed-off-by: Li Chen <chenl311@chinatelecom.cn>
Reviewed-by: Ming Lei <ming.lei@redhat.com>
Reviewed-by: Yang Erkun <yangerkun@huawei.com>
---
changelog:
v2: add review by, Fixes and cc stable tags.
drivers/block/loop.c | 8 ++++++--
1 file changed, 6 insertions(+), 2 deletions(-)
diff --git a/drivers/block/loop.c b/drivers/block/loop.c
index 053a086d547e..94ec7f747f36 100644
--- a/drivers/block/loop.c
+++ b/drivers/block/loop.c
@@ -551,8 +551,10 @@ static int loop_change_fd(struct loop_device *lo, struct block_device *bdev,
return -EBADF;
error = loop_check_backing_file(file);
- if (error)
+ if (error) {
+ fput(file);
return error;
+ }
/* suppress uevents while reconfiguring the device */
dev_set_uevent_suppress(disk_to_dev(lo->lo_disk), 1);
@@ -993,8 +995,10 @@ static int loop_configure(struct loop_device *lo, blk_mode_t mode,
return -EBADF;
error = loop_check_backing_file(file);
- if (error)
+ if (error) {
+ fput(file);
return error;
+ }
is_loop = is_loop_device(file);
--
2.51.0