lkml.org 
[lkml]   [2023]   [May]   [10]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
Patch in this message
/
From
Subject[PATCH] i2c: fix crash with msgs is NULL points
Date
From: youwan Wang <wangyouwan@126.com>

There is some probability that msgs is empty

Signed-off-by: youwan Wang <wangyouwan@126.com>
---
drivers/i2c/busses/i2c-designware-master.c | 7 ++++++-
1 file changed, 6 insertions(+), 1 deletion(-)

diff --git a/drivers/i2c/busses/i2c-designware-master.c b/drivers/i2c/busses/i2c-designware-master.c
index 55ea91a63382..e11a73fd0a41 100644
--- a/drivers/i2c/busses/i2c-designware-master.c
+++ b/drivers/i2c/busses/i2c-designware-master.c
@@ -366,12 +366,17 @@ i2c_dw_xfer_msg(struct dw_i2c_dev *dev)
struct i2c_msg *msgs = dev->msgs;
u32 intr_mask;
int tx_limit, rx_limit;
- u32 addr = msgs[dev->msg_write_idx].addr;
+ u32 addr;
u32 buf_len = dev->tx_buf_len;
u8 *buf = dev->tx_buf;
bool need_restart = false;
unsigned int flr;

+ if (WARN_ON(!msgs))
+ return;
+
+ addr = msgs[dev->msg_write_idx].addr;
+
intr_mask = DW_IC_INTR_MASTER_MASK;

for (; dev->msg_write_idx < dev->msgs_num; dev->msg_write_idx++) {
--
2.25.1
\
 
 \ /
  Last update: 2023-05-10 10:43    [W:0.030 / U:0.212 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site