This is a note to let you know that I've just added the patch titled
hwmon: (coretemp) Fix out-of-bounds memory access
to the 4.19-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-out-of-bounds-memory-access.patch
and it can be found in the queue-4.19 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
commit 276510eb5a24572f573b8008bf7807bc9c7ca910
Author: Zhang Rui <rui.zhang@xxxxxxxxx>
Date: Fri Feb 2 17:21:34 2024 +0800
hwmon: (coretemp) Fix out-of-bounds memory access
[ Upstream commit 4e440abc894585a34c2904a32cd54af1742311b3 ]
Fix a bug that pdata->cpu_map[] is set before out-of-bounds check.
The problem might be triggered on systems with more than 128 cores per
package.
Fixes: 7108b80a542b ("hwmon/coretemp: Handle large core ID value")
Signed-off-by: Zhang Rui <rui.zhang@xxxxxxxxx>
Cc: <stable@xxxxxxxxxxxxxxx>
Link: https://lore.kernel.org/r/20240202092144.71180-2-rui.zhang@xxxxxxxxx
Signed-off-by: Guenter Roeck <linux@xxxxxxxxxxxx>
Stable-dep-of: fdaf0c8629d4 ("hwmon: (coretemp) Fix bogus core_id to attr name mapping")
Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx>
diff --git a/drivers/hwmon/coretemp.c b/drivers/hwmon/coretemp.c
index 33371f7a4c0f..6832569c9bac 100644
--- a/drivers/hwmon/coretemp.c
+++ b/drivers/hwmon/coretemp.c
@@ -480,18 +480,14 @@ static int create_core_data(struct platform_device *pdev, unsigned int cpu,
if (pkg_flag) {
attr_no = PKG_SYSFS_ATTR_NO;
} else {
- index = ida_alloc(&pdata->ida, GFP_KERNEL);
+ index = ida_alloc_max(&pdata->ida, NUM_REAL_CORES - 1, GFP_KERNEL);
if (index < 0)
return index;
+
pdata->cpu_map[index] = topology_core_id(cpu);
attr_no = index + BASE_SYSFS_ATTR_NO;
}
- if (attr_no > MAX_CORE_DATA - 1) {
- err = -ERANGE;
- goto ida_free;
- }
-
tdata = init_temp_data(cpu, pkg_flag);
if (!tdata) {
err = -ENOMEM;
