Patch "watchdog: pcwd_usb: Fix attempting to access uninitialized memory" has been added to the 5.10-stable tree

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This is a note to let you know that I've just added the patch titled

    watchdog: pcwd_usb: Fix attempting to access uninitialized memory

to the 5.10-stable tree which can be found at:
    http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary

The filename of the patch is:
     watchdog-pcwd_usb-fix-attempting-to-access-uninitial.patch
and it can be found in the queue-5.10 subdirectory.

If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.



commit 2ac80a725aa529de69a0e39fe958dc9b1b78dd14
Author: Li Hua <hucool.lihua@xxxxxxxxxx>
Date:   Wed Nov 16 10:07:06 2022 +0800

    watchdog: pcwd_usb: Fix attempting to access uninitialized memory
    
    [ Upstream commit 7d06c07c67100fd0f8e6b3ab7145ce789f788117 ]
    
    The stack variable msb and lsb may be used uninitialized in function
    usb_pcwd_get_temperature and usb_pcwd_get_timeleft when usb card no response.
    
    The build waring is:
    drivers/watchdog/pcwd_usb.c:336:22: error: ‘lsb’ is used uninitialized in this function [-Werror=uninitialized]
      *temperature = (lsb * 9 / 5) + 32;
                      ~~~~^~~
    drivers/watchdog/pcwd_usb.c:328:21: note: ‘lsb’ was declared here
      unsigned char msb, lsb;
                         ^~~
    cc1: all warnings being treated as errors
    scripts/Makefile.build:250: recipe for target 'drivers/watchdog/pcwd_usb.o' failed
    make[3]: *** [drivers/watchdog/pcwd_usb.o] Error 1
    
    Fixes: b7e04f8c61a4 ("mv watchdog tree under drivers")
    Signed-off-by: Li Hua <hucool.lihua@xxxxxxxxxx>
    Reviewed-by: Guenter Roeck <linux@xxxxxxxxxxxx>
    Link: https://lore.kernel.org/r/20221116020706.70847-1-hucool.lihua@xxxxxxxxxx
    Signed-off-by: Guenter Roeck <linux@xxxxxxxxxxxx>
    Signed-off-by: Wim Van Sebroeck <wim@xxxxxxxxxxxxxxxxxx>
    Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx>

diff --git a/drivers/watchdog/pcwd_usb.c b/drivers/watchdog/pcwd_usb.c
index 1bdaf17c1d38d..8202f0a6b0935 100644
--- a/drivers/watchdog/pcwd_usb.c
+++ b/drivers/watchdog/pcwd_usb.c
@@ -325,7 +325,8 @@ static int usb_pcwd_set_heartbeat(struct usb_pcwd_private *usb_pcwd, int t)
 static int usb_pcwd_get_temperature(struct usb_pcwd_private *usb_pcwd,
 							int *temperature)
 {
-	unsigned char msb, lsb;
+	unsigned char msb = 0x00;
+	unsigned char lsb = 0x00;
 
 	usb_pcwd_send_command(usb_pcwd, CMD_READ_TEMP, &msb, &lsb);
 
@@ -341,7 +342,8 @@ static int usb_pcwd_get_temperature(struct usb_pcwd_private *usb_pcwd,
 static int usb_pcwd_get_timeleft(struct usb_pcwd_private *usb_pcwd,
 								int *time_left)
 {
-	unsigned char msb, lsb;
+	unsigned char msb = 0x00;
+	unsigned char lsb = 0x00;
 
 	/* Read the time that's left before rebooting */
 	/* Note: if the board is not yet armed then we will read 0xFFFF */



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