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block/blk-iocost: ensure 'ret' is set on error

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In case blkg_conf_open_bdev_frozen() fails, ioc_qos_write() jumps to the
error path without assigning a value to 'ret'. Ensure that it inherits
the error from the passed back error value.

Reported-by: kernel test robot <lkp@intel.com>
Closes: https://lore.kernel.org/oe-kbuild-all/202503200454.QWpwKeJu-lkp@intel.com/
Fixes: 9730763f4756 ("block: correct locking order for protecting blk-wbt parameters")
Signed-off-by: Jens Axboe <axboe@kernel.dk>
This commit is contained in:
Jens Axboe 2025-03-19 14:36:33 -06:00
parent 9730763f47
commit 03c90afb21
1 changed files with 3 additions and 1 deletions
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4
block/blk-iocost.c
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@ -3229,8 +3229,10 @@ static ssize_t ioc_qos_write(struct kernfs_open_file *of, char *input,
blkg_conf_init(&ctx, input);
memflags = blkg_conf_open_bdev_frozen(&ctx);
if (IS_ERR_VALUE(memflags))
if (IS_ERR_VALUE(memflags)) {
ret = memflags;
goto err;
}
body = ctx.body;
disk = ctx.bdev->bd_disk;