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authorChengyu Song <csong84@gatech.edu>2015-03-24 09:37:53 -0500
committerBob Peterson <rpeterso@redhat.com>2015-03-30 09:13:29 -0500
commit7b4ddfa7c9523a19fca30830f8b426964d359da2 (patch)
treea216c677645c3783b3a8263901d4da122d9929fe /fs/gfs2/glock.c
parentd9be0cda774e7fe36651b04a89a42e9e354e43c3 (diff)
gfs2: 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. Signed-off-by: Chengyu Song <csong84@gatech.edu> Signed-off-by: Bob Peterson <rpeterso@redhat.com> Acked-by: Steven Whitehouse <swhiteho@redhat.com>
Diffstat (limited to 'fs/gfs2/glock.c')
-rw-r--r--fs/gfs2/glock.c47
1 files changed, 28 insertions, 19 deletions
diff --git a/fs/gfs2/glock.c b/fs/gfs2/glock.c
index f42dffba056a..0fa8062f85a7 100644
--- a/fs/gfs2/glock.c
+++ b/fs/gfs2/glock.c
@@ -2047,34 +2047,41 @@ static const struct file_operations gfs2_sbstats_fops = {
int gfs2_create_debugfs_file(struct gfs2_sbd *sdp)
{
- sdp->debugfs_dir = debugfs_create_dir(sdp->sd_table_name, gfs2_root);
- if (!sdp->debugfs_dir)
- return -ENOMEM;
- sdp->debugfs_dentry_glocks = debugfs_create_file("glocks",
- S_IFREG | S_IRUGO,
- sdp->debugfs_dir, sdp,
- &gfs2_glocks_fops);
- if (!sdp->debugfs_dentry_glocks)
+ struct dentry *dent;
+
+ dent = debugfs_create_dir(sdp->sd_table_name, gfs2_root);
+ if (IS_ERR_OR_NULL(dent))
+ goto fail;
+ sdp->debugfs_dir = dent;
+
+ dent = debugfs_create_file("glocks",
+ S_IFREG | S_IRUGO,
+ sdp->debugfs_dir, sdp,
+ &gfs2_glocks_fops);
+ if (IS_ERR_OR_NULL(dent))
goto fail;
+ sdp->debugfs_dentry_glocks = dent;
- sdp->debugfs_dentry_glstats = debugfs_create_file("glstats",
- S_IFREG | S_IRUGO,
- sdp->debugfs_dir, sdp,
- &gfs2_glstats_fops);
- if (!sdp->debugfs_dentry_glstats)
+ dent = debugfs_create_file("glstats",
+ S_IFREG | S_IRUGO,
+ sdp->debugfs_dir, sdp,
+ &gfs2_glstats_fops);
+ if (IS_ERR_OR_NULL(dent))
goto fail;
+ sdp->debugfs_dentry_glstats = dent;
- sdp->debugfs_dentry_sbstats = debugfs_create_file("sbstats",
- S_IFREG | S_IRUGO,
- sdp->debugfs_dir, sdp,
- &gfs2_sbstats_fops);
- if (!sdp->debugfs_dentry_sbstats)
+ dent = debugfs_create_file("sbstats",
+ S_IFREG | S_IRUGO,
+ sdp->debugfs_dir, sdp,
+ &gfs2_sbstats_fops);
+ if (IS_ERR_OR_NULL(dent))
goto fail;
+ sdp->debugfs_dentry_sbstats = dent;
return 0;
fail:
gfs2_delete_debugfs_file(sdp);
- return -ENOMEM;
+ return dent ? PTR_ERR(dent) : -ENOMEM;
}
void gfs2_delete_debugfs_file(struct gfs2_sbd *sdp)
@@ -2100,6 +2107,8 @@ void gfs2_delete_debugfs_file(struct gfs2_sbd *sdp)
int gfs2_register_debugfs(void)
{
gfs2_root = debugfs_create_dir("gfs2", NULL);
+ if (IS_ERR(gfs2_root))
+ return PTR_ERR(gfs2_root);
return gfs2_root ? 0 : -ENOMEM;
}