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block/rnbd-clt: Fix possible memleak

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In error case, we do not free the memory for blk_symlink_name.

Do it by free the memory in error case, and set to NULL
afterwards.

Also fix the condition in rnbd_clt_remove_dev_symlink.

Fixes: 64e8a6ece1a5 ("block/rnbd-clt: Dynamically alloc buffer for pathname & blk_symlink_name")
Signed-off-by: Jack Wang <jinpu.wang@cloud.ionos.com>
Reviewed-by: Md Haris Iqbal <haris.iqbal@cloud.ionos.com>
Signed-off-by: Jens Axboe <axboe@kernel.dk>
This commit is contained in:
Jack Wang 2020-12-10 11:18:21 +01:00 committed by Jens Axboe
parent e7508d4856
commit 46067844ef
1 changed files with 3 additions and 2 deletions
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5
drivers/block/rnbd/rnbd-clt-sysfs.c
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@ -432,7 +432,7 @@ void rnbd_clt_remove_dev_symlink(struct rnbd_clt_dev *dev)
* i.e. rnbd_clt_unmap_dev_store() leading to a sysfs warning because
* of sysfs link already was removed already.
*/
if (strlen(dev->blk_symlink_name) && try_module_get(THIS_MODULE)) {
if (dev->blk_symlink_name && try_module_get(THIS_MODULE)) {
sysfs_remove_link(rnbd_devs_kobj, dev->blk_symlink_name);
kfree(dev->blk_symlink_name);
module_put(THIS_MODULE);
@ -521,7 +521,8 @@ static int rnbd_clt_add_dev_symlink(struct rnbd_clt_dev *dev)
return 0;
out_err:
dev->blk_symlink_name[0] = '\0';
kfree(dev->blk_symlink_name);
dev->blk_symlink_name = NULL ;
return ret;
}