Patch "hwmon: (coretemp) Fix potentially truncated sysfs attribute name" has been added to the 5.15-stable tree

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

    hwmon: (coretemp) Fix potentially truncated sysfs attribute name

to the 5.15-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:
     hwmon-coretemp-fix-potentially-truncated-sysfs-attri.patch
and it can be found in the queue-5.15 subdirectory.

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



commit 5a7a3bc9892d481822a86b391bf8e981fec489a2
Author: Zhang Rui <rui.zhang@xxxxxxxxx>
Date:   Wed Oct 25 20:23:16 2023 +0800

    hwmon: (coretemp) Fix potentially truncated sysfs attribute name
    
    [ Upstream commit bbfff736d30e5283ad09e748caff979d75ddef7f ]
    
    When build with W=1 and "-Werror=format-truncation", below error is
    observed in coretemp driver,
    
       drivers/hwmon/coretemp.c: In function 'create_core_data':
    >> drivers/hwmon/coretemp.c:393:34: error: '%s' directive output may be truncated writing likely 5 or more bytes into a region of size between 3 and 13 [-Werror=format-truncation=]
         393 |                          "temp%d_%s", attr_no, suffixes[i]);
             |                                  ^~
       drivers/hwmon/coretemp.c:393:26: note: assuming directive output of 5 bytes
         393 |                          "temp%d_%s", attr_no, suffixes[i]);
             |                          ^~~~~~~~~~~
       drivers/hwmon/coretemp.c:392:17: note: 'snprintf' output 7 or more bytes (assuming 22) into a destination of size 19
         392 |                 snprintf(tdata->attr_name[i], CORETEMP_NAME_LENGTH,
             |                 ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
         393 |                          "temp%d_%s", attr_no, suffixes[i]);
             |                          ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
       cc1: all warnings being treated as errors
    
    Given that
    1. '%d' could take 10 charactors,
    2. '%s' could take 10 charactors ("crit_alarm"),
    3. "temp", "_" and the NULL terminator take 6 charactors,
    fix the problem by increasing CORETEMP_NAME_LENGTH to 28.
    
    Signed-off-by: Zhang Rui <rui.zhang@xxxxxxxxx>
    Fixes: 7108b80a542b ("hwmon/coretemp: Handle large core ID value")
    Reported-by: kernel test robot <lkp@xxxxxxxxx>
    Closes: https://lore.kernel.org/oe-kbuild-all/202310200443.iD3tUbbK-lkp@xxxxxxxxx/
    Link: https://lore.kernel.org/r/20231025122316.836400-1-rui.zhang@xxxxxxxxx
    Signed-off-by: Guenter Roeck <linux@xxxxxxxxxxxx>
    Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx>

diff --git a/drivers/hwmon/coretemp.c b/drivers/hwmon/coretemp.c
index eaae5de2ab616..5b2057ce5a59d 100644
--- a/drivers/hwmon/coretemp.c
+++ b/drivers/hwmon/coretemp.c
@@ -41,7 +41,7 @@ MODULE_PARM_DESC(tjmax, "TjMax value in degrees Celsius");
 #define PKG_SYSFS_ATTR_NO	1	/* Sysfs attribute for package temp */
 #define BASE_SYSFS_ATTR_NO	2	/* Sysfs Base attr no for coretemp */
 #define NUM_REAL_CORES		128	/* Number of Real cores per cpu */
-#define CORETEMP_NAME_LENGTH	19	/* String Length of attrs */
+#define CORETEMP_NAME_LENGTH	28	/* String Length of attrs */
 #define MAX_CORE_ATTRS		4	/* Maximum no of basic attrs */
 #define TOTAL_ATTRS		(MAX_CORE_ATTRS + 1)
 #define MAX_CORE_DATA		(NUM_REAL_CORES + BASE_SYSFS_ATTR_NO)



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