mirror of
https://github.com/Divested-Mobile/DivestOS-Build.git
synced 2024-12-22 06:04:57 -05:00
53 lines
1.7 KiB
Diff
53 lines
1.7 KiB
Diff
From 42627c94cf8c189332a6f5bfdd465ea662777911 Mon Sep 17 00:00:00 2001
|
|
From: Harsh Sahu <hsahu@codeaurora.org>
|
|
Date: Thu, 13 Apr 2017 15:38:46 -0700
|
|
Subject: msm: mdss: fix race condition during mdp debugfs release
|
|
|
|
Fix race condition in the release of the mdp debugfs functions
|
|
panel_debug_base_release and mdss_debug_base_release by adding
|
|
the lock for unpreempted freeing of the buffer so that multiple
|
|
concurrent processes cannot affect the release which can possibly
|
|
lead to use-after-free operation on the buffer.
|
|
|
|
Change-Id: I9586081b65ae2eb0e7f6e30c606ee748ae9ef7e8
|
|
Signed-off-by: Harsh Sahu <hsahu@codeaurora.org>
|
|
---
|
|
drivers/video/msm/mdss/mdss_debug.c | 4 ++++
|
|
1 file changed, 4 insertions(+)
|
|
|
|
diff --git a/drivers/video/msm/mdss/mdss_debug.c b/drivers/video/msm/mdss/mdss_debug.c
|
|
index 920babf..78bfe50 100644
|
|
--- a/drivers/video/msm/mdss/mdss_debug.c
|
|
+++ b/drivers/video/msm/mdss/mdss_debug.c
|
|
@@ -57,11 +57,13 @@ static int panel_debug_base_open(struct inode *inode, struct file *file)
|
|
static int panel_debug_base_release(struct inode *inode, struct file *file)
|
|
{
|
|
struct mdss_debug_base *dbg = file->private_data;
|
|
+ mutex_lock(&mdss_debug_lock);
|
|
if (dbg && dbg->buf) {
|
|
kfree(dbg->buf);
|
|
dbg->buf_len = 0;
|
|
dbg->buf = NULL;
|
|
}
|
|
+ mutex_unlock(&mdss_debug_lock);
|
|
return 0;
|
|
}
|
|
|
|
@@ -386,11 +388,13 @@ static int mdss_debug_base_open(struct inode *inode, struct file *file)
|
|
static int mdss_debug_base_release(struct inode *inode, struct file *file)
|
|
{
|
|
struct mdss_debug_base *dbg = file->private_data;
|
|
+ mutex_lock(&mdss_debug_lock);
|
|
if (dbg && dbg->buf) {
|
|
kfree(dbg->buf);
|
|
dbg->buf_len = 0;
|
|
dbg->buf = NULL;
|
|
}
|
|
+ mutex_unlock(&mdss_debug_lock);
|
|
return 0;
|
|
}
|
|
|
|
--
|
|
cgit v1.1
|
|
|