github-mirror/linux
1
0
Fork 0
mirror of https://github.com/torvalds/linux.git synced 2026-05-24 23:22:31 +02:00
Code Issues Actions Packages Projects Releases Wiki Activity Graph

ACPI: processor: idle: Add missing bounds check in flatten_lpi_states()

Browse Source 
The inner loop in flatten_lpi_states() that combines composite LPI
states can increment flat_state_cnt multiple times within the loop.

The condition that guards this (checks bounds against ACPI_PROCESSOR
_MAX_POWER) occurs at the top of the outer loop. flat_state_cnt might
exceed ACPI_PROCESSOR_MAX_POWER if it is incremented multiple times
within the inner loop between outer loop iterations.

Add a bounds check after the increment inside the inner loop so that
it breaks out when flat_state_cnt reaches ACPI_PROCESSOR_MAX_POWER.
The existing check in the outer loop will then handle the warning.

Signed-off-by: Jingkai Tan <contact@jingk.ai>
Reviewed-by: Sudeep Holla <sudeep.holla@kernel.org>
Link: https://patch.msgid.link/20260305213831.53985-1-contact@jingk.ai
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
This commit is contained in:
Jingkai Tan 2026-03-05 21:38:31 +00:00 committed by Rafael J. Wysocki
parent 1f318b96cc
commit 638a95168f
1 changed files with 2 additions and 0 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

2
drivers/acpi/processor_idle.c
View File

@ -1068,6 +1068,8 @@ static unsigned int flatten_lpi_states(struct acpi_processor *pr,
stash_composite_state(curr_level, flpi);
flat_state_cnt++;
flpi++;
if (flat_state_cnt >= ACPI_PROCESSOR_MAX_POWER)
break;
}
}
}