diff options
| author | Nathan Chancellor <nathan@kernel.org> | 2024-02-26 17:54:58 -0700 |
|---|---|---|
| committer | Rafael J. Wysocki <rafael.j.wysocki@intel.com> | 2024-02-27 11:58:47 +0100 |
| commit | da1983355ccefcfb3f8eb410fff82e250fa87e39 (patch) | |
| tree | 05ed4e07bc36b2cd7744dbeb4f3e7228d693b3ab /drivers/thermal | |
| parent | a85739c8c6894c3b9ff860e79e91db44cb59bd63 (diff) | |
| download | linux-da1983355ccefcfb3f8eb410fff82e250fa87e39.tar.gz | |
thermal: core: Move initial num_trips assignment before memcpy()
When booting a CONFIG_FORTIFY_SOURCE=y kernel compiled with a toolchain
that supports __counted_by() (such as clang-18 and newer), there is a
panic on boot:
[ 2.913770] memcpy: detected buffer overflow: 72 byte write of buffer size 0
[ 2.920834] WARNING: CPU: 2 PID: 1 at lib/string_helpers.c:1027 __fortify_report+0x5c/0x74
...
[ 3.039208] Call trace:
[ 3.041643] __fortify_report+0x5c/0x74
[ 3.045469] __fortify_panic+0x18/0x20
[ 3.049209] thermal_zone_device_register_with_trips+0x4c8/0x4f8
This panic occurs because trips is counted by num_trips but num_trips is
assigned after the call to memcpy(), so the fortify checks think the
buffer size is zero because tz was allocated with kzalloc().
Move the num_trips assignment before the memcpy() to resolve the panic
and ensure that the fortify checks work properly.
Fixes: 9b0a62758665 ("thermal: core: Store zone trips table in struct thermal_zone_device")
Signed-off-by: Nathan Chancellor <nathan@kernel.org>
Reviewed-by: Kees Cook <keescook@chromium.org>
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
Diffstat (limited to 'drivers/thermal')
| -rw-r--r-- | drivers/thermal/thermal_core.c | 2 |
1 files changed, 1 insertions, 1 deletions
diff --git a/drivers/thermal/thermal_core.c b/drivers/thermal/thermal_core.c index bb21f78b4bfa4..1eabc8ebe27d3 100644 --- a/drivers/thermal/thermal_core.c +++ b/drivers/thermal/thermal_core.c @@ -1354,8 +1354,8 @@ thermal_zone_device_register_with_trips(const char *type, tz->device.class = thermal_class; tz->devdata = devdata; - memcpy(tz->trips, trips, num_trips * sizeof(*trips)); tz->num_trips = num_trips; + memcpy(tz->trips, trips, num_trips * sizeof(*trips)); thermal_set_delay_jiffies(&tz->passive_delay_jiffies, passive_delay); thermal_set_delay_jiffies(&tz->polling_delay_jiffies, polling_delay); |