From: Rabin Vincent <rabin.vincent@stericsson.com>
Date: Wed, 22 Feb 2012 10:28:00 +0000 (+0530)
Subject: staging: logger: hold mutex while removing reader
X-Git-Tag: firefly_0821_release~7613^2~9
X-Git-Url: http://demsky.eecs.uci.edu/git/?a=commitdiff_plain;h=1bbba88f7775c1d3ce20f5cfefb9e3ed09c24d4b;p=firefly-linux-kernel-4.4.55.git

staging: logger: hold mutex while removing reader

The readers list is traversed under the log->mutex lock
(for example from fix_up_readers()), but the deletion of
elements from this list is not being done under this lock.

Cc: Brian Swetland <swetland@google.com>
Cc: Dima Zavin <dima@android.com>
Signed-off-by: Rabin Vincent <rabin.vincent@stericsson.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
---

diff --git a/drivers/staging/android/logger.c b/drivers/staging/android/logger.c
index 3e09d57dc6d9..649372814a89 100644
--- a/drivers/staging/android/logger.c
+++ b/drivers/staging/android/logger.c
@@ -532,7 +532,12 @@ static int logger_release(struct inode *ignored, struct file *file)
 {
 	if (file->f_mode & FMODE_READ) {
 		struct logger_reader *reader = file->private_data;
+		struct logger_log *log = reader->log;
+
+		mutex_lock(&log->mutex);
 		list_del(&reader->list);
+		mutex_unlock(&log->mutex);
+
 		kfree(reader);
 	}