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ceph: fix potential bad pointer deref in async dirops cb's

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The new async dirops callback routines can pass ERR_PTR values to
ceph_mdsc_free_path, which could cause an oops. Make ceph_mdsc_free_path
ignore ERR_PTR values. Also, ensure that the pr_warn messages look sane
even if ceph_mdsc_build_path fails.

Reported-by: Dan Carpenter <dan.carpenter@oracle.com>
Signed-off-by: Jeff Layton <jlayton@kernel.org>
Reviewed-by: Ilya Dryomov <idryomov@gmail.com>
Signed-off-by: Ilya Dryomov <idryomov@gmail.com>
This commit is contained in:
Jeff Layton
2020-04-08 08:41:38 -04:00
committed by Ilya Dryomov
parent 8ae0299a4b
commit 2a575f138d
3 changed files with 5 additions and 5 deletions
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2
fs/ceph/mds_client.h
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@@ -521,7 +521,7 @@ extern void ceph_mdsc_pre_umount(struct ceph_mds_client *mdsc);
static inline void ceph_mdsc_free_path(char *path, int len)
{
if (path)
if (!IS_ERR_OR_NULL(path))
__putname(path - (PATH_MAX - 1 - len));
}