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eventfs: Make sure that parent->d_inode is locked in creating files/dirs

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commit f49f950c21 upstream.

Since the locking of the parent->d_inode has been moved outside the
creation of the files and directories (as it use to be locked via a
conditional), add a WARN_ON_ONCE() to the case that it's not locked.

Link: https://lkml.kernel.org/r/20231121231112.853962542@goodmis.org

Cc: Masami Hiramatsu <mhiramat@kernel.org>
Cc: Mark Rutland <mark.rutland@arm.com>
Cc: Andrew Morton <akpm@linux-foundation.org>
Reviewed-by: Josef Bacik <josef@toxicpanda.com>
Signed-off-by: Steven Rostedt (Google) <rostedt@goodmis.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Steven Rostedt (Google)
2024-02-06 07:09:34 -05:00
committed by Greg Kroah-Hartman
parent 29bb70cad6
commit 6eee5c6708
1 changed files with 4 additions and 0 deletions
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fs/tracefs/event_inode.c
+4
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@@ -327,6 +327,8 @@ create_file_dentry(struct eventfs_inode *ei, int idx,
struct dentry **e_dentry = &ei->d_children[idx];
struct dentry *dentry;
WARN_ON_ONCE(!inode_is_locked(parent->d_inode));
mutex_lock(&eventfs_mutex);
if (ei->is_freed) {
mutex_unlock(&eventfs_mutex);
@@ -430,6 +432,8 @@ create_dir_dentry(struct eventfs_inode *pei, struct eventfs_inode *ei,
{
struct dentry *dentry = NULL;
WARN_ON_ONCE(!inode_is_locked(parent->d_inode));
mutex_lock(&eventfs_mutex);
if (pei->is_freed || ei->is_freed) {
mutex_unlock(&eventfs_mutex);