diff options
| author | Mate Kukri <km@mkukri.xyz> | 2024-08-01 19:40:52 +0100 |
|---|---|---|
| committer | Nico Huber <nico.h@gmx.de> | 2024-08-03 14:00:26 +0000 |
| commit | ac9ffb94324e45ee19e9dcbf2847744992ed572f (patch) | |
| tree | 4caa1253c163f1f920ab9612d0292d5b2613b6d4 /src/mainboard/dell | |
| parent | b256e6303c13abc13825bf2d3fb2fbc2ed1fd788 (diff) | |
mb/dell/optiplex_9020: Fix UB in package power calculation
Fix potential undefined behaviour in the `get_pkg_power()` function:
- If `rapl_power_unit == 0`, `pkg_power_info / rapl_power_unit` is
invalid
- If `rapl_power_unit > 7`, the result of the shift doesn't fit into a
`uint8_t`
Signed-off-by: Mate Kukri <km@mkukri.xyz>
Change-Id: I48ef59c4fbeb0a55675ac24da31e6e0b194cb58d
Reviewed-on: https://review.coreboot.org/c/coreboot/+/83736
Reviewed-by: Angel Pons <th3fanbus@gmail.com>
Reviewed-by: Nico Huber <nico.h@gmx.de>
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Elyes Haouas <ehaouas@noos.fr>
Diffstat (limited to 'src/mainboard/dell')
| -rw-r--r-- | src/mainboard/dell/optiplex_9020/mainboard.c | 8 |
1 files changed, 3 insertions, 5 deletions
diff --git a/src/mainboard/dell/optiplex_9020/mainboard.c b/src/mainboard/dell/optiplex_9020/mainboard.c index 6630a12e2a..1cb850c46c 100644 --- a/src/mainboard/dell/optiplex_9020/mainboard.c +++ b/src/mainboard/dell/optiplex_9020/mainboard.c @@ -303,11 +303,9 @@ static uint8_t get_temp_target(void) static uint16_t get_pkg_power(void) { - uint8_t rapl_power_unit = rdmsr(0x606).lo & 0xf; - if (rapl_power_unit) - rapl_power_unit = 2 << (rapl_power_unit - 1); - uint16_t pkg_power_info = rdmsr(0x614).lo & 0x7fff; - if (pkg_power_info / rapl_power_unit > 0x41) + const unsigned int pkg_power = rdmsr(0x614).lo & 0x7fff; + const unsigned int power_unit = 1 << (rdmsr(0x606).lo & 0xf); + if (pkg_power / power_unit > 65) return 32; else return 16; |