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ocfs2: incorrect check for debugfs returns

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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>
This commit is contained in:
Chengyu Song 2015-04-14 15:43:44 -07:00 committed by Linus Torvalds
parent 762515a8e9
commit e2ac55b6a8
3 changed files with 37 additions and 16 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

42
fs/ocfs2/cluster/heartbeat.c
View File

@ -1312,7 +1312,9 @@ static int o2hb_debug_init(void)
int ret = -ENOMEM;
o2hb_debug_dir = debugfs_create_dir(O2HB_DEBUG_DIR, NULL);
if (!o2hb_debug_dir) {
if (IS_ERR_OR_NULL(o2hb_debug_dir)) {
ret = o2hb_debug_dir ?
PTR_ERR(o2hb_debug_dir) : -ENOMEM;
mlog_errno(ret);
goto bail;
}
@ -1325,7 +1327,9 @@ static int o2hb_debug_init(void)
sizeof(o2hb_live_node_bitmap),
O2NM_MAX_NODES,
o2hb_live_node_bitmap);
if (!o2hb_debug_livenodes) {
if (IS_ERR_OR_NULL(o2hb_debug_livenodes)) {
ret = o2hb_debug_livenodes ?
PTR_ERR(o2hb_debug_livenodes) : -ENOMEM;
mlog_errno(ret);
goto bail;
}
@ -1338,7 +1342,9 @@ static int o2hb_debug_init(void)
sizeof(o2hb_live_region_bitmap),
O2NM_MAX_REGIONS,
o2hb_live_region_bitmap);
if (!o2hb_debug_liveregions) {
if (IS_ERR_OR_NULL(o2hb_debug_liveregions)) {
ret = o2hb_debug_liveregions ?
PTR_ERR(o2hb_debug_liveregions) : -ENOMEM;
mlog_errno(ret);
goto bail;
}
@ -1352,7 +1358,9 @@ static int o2hb_debug_init(void)
sizeof(o2hb_quorum_region_bitmap),
O2NM_MAX_REGIONS,
o2hb_quorum_region_bitmap);
if (!o2hb_debug_quorumregions) {
if (IS_ERR_OR_NULL(o2hb_debug_quorumregions)) {
ret = o2hb_debug_quorumregions ?
PTR_ERR(o2hb_debug_quorumregions) : -ENOMEM;
mlog_errno(ret);
goto bail;
}
@ -1366,7 +1374,9 @@ static int o2hb_debug_init(void)
sizeof(o2hb_failed_region_bitmap),
O2NM_MAX_REGIONS,
o2hb_failed_region_bitmap);
if (!o2hb_debug_failedregions) {
if (IS_ERR_OR_NULL(o2hb_debug_failedregions)) {
ret = o2hb_debug_failedregions ?
PTR_ERR(o2hb_debug_failedregions) : -ENOMEM;
mlog_errno(ret);
goto bail;
}
@ -2000,7 +2010,8 @@ static int o2hb_debug_region_init(struct o2hb_region *reg, struct dentry *dir)
reg->hr_debug_dir =
debugfs_create_dir(config_item_name(&reg->hr_item), dir);
if (!reg->hr_debug_dir) {
if (IS_ERR_OR_NULL(reg->hr_debug_dir)) {
ret = reg->hr_debug_dir ? PTR_ERR(reg->hr_debug_dir) : -ENOMEM;
mlog_errno(ret);
goto bail;
}
@ -2013,7 +2024,9 @@ static int o2hb_debug_region_init(struct o2hb_region *reg, struct dentry *dir)
O2HB_DB_TYPE_REGION_LIVENODES,
sizeof(reg->hr_live_node_bitmap),
O2NM_MAX_NODES, reg);
if (!reg->hr_debug_livenodes) {
if (IS_ERR_OR_NULL(reg->hr_debug_livenodes)) {
ret = reg->hr_debug_livenodes ?
PTR_ERR(reg->hr_debug_livenodes) : -ENOMEM;
mlog_errno(ret);
goto bail;
}
@ -2025,7 +2038,9 @@ static int o2hb_debug_region_init(struct o2hb_region *reg, struct dentry *dir)
sizeof(*(reg->hr_db_regnum)),
O2HB_DB_TYPE_REGION_NUMBER,
0, O2NM_MAX_NODES, reg);
if (!reg->hr_debug_regnum) {
if (IS_ERR_OR_NULL(reg->hr_debug_regnum)) {
ret = reg->hr_debug_regnum ?
PTR_ERR(reg->hr_debug_regnum) : -ENOMEM;
mlog_errno(ret);
goto bail;
}
@ -2037,7 +2052,9 @@ static int o2hb_debug_region_init(struct o2hb_region *reg, struct dentry *dir)
sizeof(*(reg->hr_db_elapsed_time)),
O2HB_DB_TYPE_REGION_ELAPSED_TIME,
0, 0, reg);
if (!reg->hr_debug_elapsed_time) {
if (IS_ERR_OR_NULL(reg->hr_debug_elapsed_time)) {
ret = reg->hr_debug_elapsed_time ?
PTR_ERR(reg->hr_debug_elapsed_time) : -ENOMEM;
mlog_errno(ret);
goto bail;
}
@ -2049,13 +2066,16 @@ static int o2hb_debug_region_init(struct o2hb_region *reg, struct dentry *dir)
sizeof(*(reg->hr_db_pinned)),
O2HB_DB_TYPE_REGION_PINNED,
0, 0, reg);
if (!reg->hr_debug_pinned) {
if (IS_ERR_OR_NULL(reg->hr_debug_pinned)) {
ret = reg->hr_debug_pinned ?
PTR_ERR(reg->hr_debug_pinned) : -ENOMEM;
mlog_errno(ret);
goto bail;
}
ret = 0;
return 0;
bail:
debugfs_remove_recursive(reg->hr_debug_dir);
return ret;
}

2
fs/ocfs2/dlmglue.c
View File

@ -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");

9
fs/ocfs2/super.c
View File

@ -1112,7 +1112,7 @@ static int ocfs2_fill_super(struct super_block *sb, void *data, int silent)
osb->osb_debug_root = debugfs_create_dir(osb->uuid_str,
ocfs2_debugfs_root);
if (!osb->osb_debug_root) {
if (IS_ERR_OR_NULL(osb->osb_debug_root)) {
status = -EINVAL;
mlog(ML_ERROR, "Unable to create per-mount debugfs root.\n");
goto read_super_error;
@ -1122,7 +1122,7 @@ static int ocfs2_fill_super(struct super_block *sb, void *data, int silent)
osb->osb_debug_root,
osb,
&ocfs2_osb_debug_fops);
if (!osb->osb_ctxt) {
if (IS_ERR_OR_NULL(osb->osb_ctxt)) {
status = -EINVAL;
mlog_errno(status);
goto read_super_error;
@ -1606,8 +1606,9 @@ static int __init ocfs2_init(void)
}
ocfs2_debugfs_root = debugfs_create_dir("ocfs2", NULL);
if (!ocfs2_debugfs_root) {
status = -ENOMEM;
if (IS_ERR_OR_NULL(ocfs2_debugfs_root)) {
status = ocfs2_debugfs_root ?
PTR_ERR(ocfs2_debugfs_root) : -ENOMEM;
mlog(ML_ERROR, "Unable to create ocfs2 debugfs root.\n");
goto out4;
}