diff options
| author | Jacob Garber <jgarber1@ualberta.ca> | 2019-07-22 15:16:30 -0600 |
|---|---|---|
| committer | Patrick Georgi <pgeorgi@google.com> | 2019-07-30 09:56:02 +0000 |
| commit | bcdb893778f857f310115522bbf7d70ad0cc017f (patch) | |
| tree | 4a8e4314bdc7527f130bc78e172212cd054e54c0 | |
| parent | 4926e989ac2f83bd887bee683c7e2c0481f5cd3a (diff) | |
soc/intel/{broad,cannon,sky}: Fix possible out-of-bounds reads
There will be a possible out of bounds array access if
power_limit_1_time == ARRAY_SIZE(power_limit_time_sec_to_msr), so
prevent that in the index check. This issue was fixed for other cpus in
commit 5cfef13f8d (cpu/intel: Fix out-of-bounds read due to off-by-one
in condition). Based on the discussion for that commit, also remove the
magic constant 28 in favour of the index of the last array element.
Change-Id: Ic3f8735b23a368f8a9395757bd52c2c40088afa1
Signed-off-by: Jacob Garber <jgarber1@ualberta.ca>
Found-by: Coverity CID 1229673
Reviewed-on: https://review.coreboot.org/c/coreboot/+/34498
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Patrick Rudolph <siro@das-labor.org>
| -rw-r--r-- | src/soc/intel/broadwell/cpu.c | 4 | ||||
| -rw-r--r-- | src/soc/intel/cannonlake/cpu.c | 4 | ||||
| -rw-r--r-- | src/soc/intel/skylake/cpu.c | 4 |
3 files changed, 6 insertions, 6 deletions
diff --git a/src/soc/intel/broadwell/cpu.c b/src/soc/intel/broadwell/cpu.c index af587ee542..5ccaeaf810 100644 --- a/src/soc/intel/broadwell/cpu.c +++ b/src/soc/intel/broadwell/cpu.c @@ -324,8 +324,8 @@ void set_power_limits(u8 power_limit_1_time) unsigned int tdp, min_power, max_power, max_time; u8 power_limit_1_val; - if (power_limit_1_time > ARRAY_SIZE(power_limit_time_sec_to_msr)) - power_limit_1_time = 28; + if (power_limit_1_time >= ARRAY_SIZE(power_limit_time_sec_to_msr)) + power_limit_1_time = ARRAY_SIZE(power_limit_time_sec_to_msr) - 1; if (!(msr.lo & PLATFORM_INFO_SET_TDP)) return; diff --git a/src/soc/intel/cannonlake/cpu.c b/src/soc/intel/cannonlake/cpu.c index 7eb413caa6..b0eaa5dd34 100644 --- a/src/soc/intel/cannonlake/cpu.c +++ b/src/soc/intel/cannonlake/cpu.c @@ -108,8 +108,8 @@ void set_power_limits(u8 power_limit_1_time) config_t *conf = config_of_path(SA_DEVFN_ROOT); - if (power_limit_1_time > ARRAY_SIZE(power_limit_time_sec_to_msr)) - power_limit_1_time = 28; + if (power_limit_1_time >= ARRAY_SIZE(power_limit_time_sec_to_msr)) + power_limit_1_time = ARRAY_SIZE(power_limit_time_sec_to_msr) - 1; if (!(msr.lo & PLATFORM_INFO_SET_TDP)) return; diff --git a/src/soc/intel/skylake/cpu.c b/src/soc/intel/skylake/cpu.c index 2fd01b471a..cb0ceaa0bc 100644 --- a/src/soc/intel/skylake/cpu.c +++ b/src/soc/intel/skylake/cpu.c @@ -119,8 +119,8 @@ void set_power_limits(u8 power_limit_1_time) config_t *conf = config_of_path(SA_DEVFN_ROOT); - if (power_limit_1_time > ARRAY_SIZE(power_limit_time_sec_to_msr)) - power_limit_1_time = 28; + if (power_limit_1_time >= ARRAY_SIZE(power_limit_time_sec_to_msr)) + power_limit_1_time = ARRAY_SIZE(power_limit_time_sec_to_msr) - 1; if (!(msr.lo & PLATFORM_INFO_SET_TDP)) return; |