[for-linus][PATCH] tracing: Correct the refcount if the hist/hist_debug file fails to open

[Steven Rostedt <rostedt@goodmis.org>]

  git://git.kernel.org/pub/scm/linux/kernel/git/trace/linux-trace.git
trace/fixes

Head SHA1: 0b4ffbe4888a2c71185eaf5c1a02dd3586a9bc04


Tengda Wu (1):
      tracing: Correct the refcount if the hist/hist_debug file fails to open

----
 kernel/trace/trace_events_hist.c | 24 ++++++++++++++++++------
 1 file changed, 18 insertions(+), 6 deletions(-)
---------------------------
commit 0b4ffbe4888a2c71185eaf5c1a02dd3586a9bc04
Author: Tengda Wu <wutengda@huaweicloud.com>
Date:   Fri Mar 14 06:53:35 2025 +0000

    tracing: Correct the refcount if the hist/hist_debug file fails to open
    
    The function event_{hist,hist_debug}_open() maintains the refcount of
    'file->tr' and 'file' through tracing_open_file_tr(). However, it does
    not roll back these counts on subsequent failure paths, resulting in a
    refcount leak.
    
    A very obvious case is that if the hist/hist_debug file belongs to a
    specific instance, the refcount leak will prevent the deletion of that
    instance, as it relies on the condition 'tr->ref == 1' within
    __remove_instance().
    
    Fix this by calling tracing_release_file_tr() on all failure paths in
    event_{hist,hist_debug}_open() to correct the refcount.
    
    Cc: stable@vger.kernel.org
    Cc: Masami Hiramatsu <mhiramat@kernel.org>
    Cc: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
    Cc: Zheng Yejian <zhengyejian1@huawei.com>
    Link: https://lore.kernel.org/20250314065335.1202817-1-wutengda@huaweicloud.com
    Fixes: 1cc111b9cddc ("tracing: Fix uaf issue when open the hist or hist_debug file")
    Signed-off-by: Tengda Wu <wutengda@huaweicloud.com>
    Signed-off-by: Steven Rostedt (Google) <rostedt@goodmis.org>

diff --git a/kernel/trace/trace_events_hist.c b/kernel/trace/trace_events_hist.c
index ad7419e24055..53dc6719181e 100644
--- a/kernel/trace/trace_events_hist.c
+++ b/kernel/trace/trace_events_hist.c
@@ -5689,12 +5689,16 @@ static int event_hist_open(struct inode *inode, struct file *file)
 	guard(mutex)(&event_mutex);
 
 	event_file = event_file_data(file);
-	if (!event_file)
-		return -ENODEV;
+	if (!event_file) {
+		ret = -ENODEV;
+		goto err;
+	}
 
 	hist_file = kzalloc(sizeof(*hist_file), GFP_KERNEL);
-	if (!hist_file)
-		return -ENOMEM;
+	if (!hist_file) {
+		ret = -ENOMEM;
+		goto err;
+	}
 
 	hist_file->file = file;
 	hist_file->last_act = get_hist_hit_count(event_file);
@@ -5702,9 +5706,14 @@ static int event_hist_open(struct inode *inode, struct file *file)
 	/* Clear private_data to avoid warning in single_open() */
 	file->private_data = NULL;
 	ret = single_open(file, hist_show, hist_file);
-	if (ret)
+	if (ret) {
 		kfree(hist_file);
+		goto err;
+	}
 
+	return 0;
+err:
+	tracing_release_file_tr(inode, file);
 	return ret;
 }
 
@@ -5979,7 +5988,10 @@ static int event_hist_debug_open(struct inode *inode, struct file *file)
 
 	/* Clear private_data to avoid warning in single_open() */
 	file->private_data = NULL;
-	return single_open(file, hist_debug_show, file);
+	ret = single_open(file, hist_debug_show, file);
+	if (ret)
+		tracing_release_file_tr(inode, file);
+	return ret;
 }
 
 const struct file_operations event_hist_debug_fops = {