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| author | Chengyu Song <csong84@gatech.edu> | 2015-04-14 15:43:44 -0700 |
|---|---|---|
| committer | Linus Torvalds <torvalds@linux-foundation.org> | 2015-04-14 16:48:58 -0700 |
| commit | e2ac55b6a8e337fac7cc59c6f452caac92ab5ee6 (patch) | |
| tree | 5f169fe79554f618b350761d7e428be64d7b084a /fs/ocfs2/dlmglue.c | |
| parent | 762515a8e9c7ead55539cf96a63dec2363b1df50 (diff) | |
| download | linux-riscv-e2ac55b6a8e337fac7cc59c6f452caac92ab5ee6.tar.gz linux-riscv-e2ac55b6a8e337fac7cc59c6f452caac92ab5ee6.tar.bz2 linux-riscv-e2ac55b6a8e337fac7cc59c6f452caac92ab5ee6.zip | |
ocfs2: incorrect check for debugfs returns
debugfs_create_dir and debugfs_create_file may return -ENODEV when debugfs
is not configured, so the return value should be checked against
ERROR_VALUE as well, otherwise the later dereference of the dentry pointer
would crash the kernel.
This patch tries to solve this problem by fixing certain checks. However,
I have that found other call sites are protected by #ifdef CONFIG_DEBUG_FS.
In current implementation, if CONFIG_DEBUG_FS is defined, then the above
two functions will never return any ERROR_VALUE. So another possibility
to fix this is to surround all the buggy checks/functions with the same
#ifdef CONFIG_DEBUG_FS. But I'm not sure if this would break any functionality,
as only OCFS2_FS_STATS declares dependency on DEBUG_FS.
Signed-off-by: Chengyu Song <csong84@gatech.edu>
Cc: Mark Fasheh <mfasheh@suse.com>
Cc: Joel Becker <jlbec@evilplan.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'fs/ocfs2/dlmglue.c')
| -rw-r--r-- | fs/ocfs2/dlmglue.c | 2 |
1 files changed, 1 insertions, 1 deletions
diff --git a/fs/ocfs2/dlmglue.c b/fs/ocfs2/dlmglue.c index 11849a44dc5a..23adcbf374d3 100644 --- a/fs/ocfs2/dlmglue.c +++ b/fs/ocfs2/dlmglue.c @@ -2954,7 +2954,7 @@ static int ocfs2_dlm_init_debug(struct ocfs2_super *osb) osb->osb_debug_root, osb, &ocfs2_dlm_debug_fops); - if (!dlm_debug->d_locking_state) { + if (IS_ERR_OR_NULL(dlm_debug->d_locking_state)) { ret = -EINVAL; mlog(ML_ERROR, "Unable to create locking state debugfs file.\n"); |