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timers/migration: Prevent out of bounds access on failure 

When tmigr_setup_groups() fails the level 0 group allocation, then the
cleanup derefences index -1 of the local stack array.

Prevent this by checking the loop condition first.

Fixes: 7ee9887703 ("timers: Implement the hierarchical pull model")
Signed-off-by: Levi Yun <ppbuk5246@gmail.com>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Reviewed-by: Anna-Maria Behnsen <anna-maria@linutronix.de>
Link: https://lore.kernel.org/r/20240506041059.86877-1-ppbuk5246@gmail.com
This commit is contained in:
Levi Yun 2024-05-06 05:10:59 +01:00 committed by Thomas Gleixner
parent dd5a440a31
commit d7ad05c86e
1 changed files with 2 additions and 2 deletions
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4
kernel/time/timer_migration.c
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@ -1596,7 +1596,7 @@ static int tmigr_setup_groups(unsigned int cpu, unsigned int node)
} while (i < tmigr_hierarchy_levels); } while (i < tmigr_hierarchy_levels);
do { while (i > 0) {
group = stack[--i]; group = stack[--i];
if (err < 0) { if (err < 0) {
@ -1645,7 +1645,7 @@ static int tmigr_setup_groups(unsigned int cpu, unsigned int node)
tmigr_connect_child_parent(child, group); tmigr_connect_child_parent(child, group);
} }
} }
} while (i > 0); }
kfree(stack); kfree(stack);