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fork: check charging success before zeroing stack

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No need to do zero cached stack if memcg charge fails, so move the
charging attempt before the memset operation.

[linus.walleij@linaro.org: rebased]
Link: https://lkml.kernel.org/r/20250509-fork-fixes-v3-3-e6c69dd356f2@linaro.org
Signed-off-by: Pasha Tatashin <pasha.tatashin@soleen.com>
Link: https://lore.kernel.org/20240311164638.2015063-6-pasha.tatashin@soleen.com
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
Acked-by: Mike Rapoport (Microsoft) <rppt@kernel.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
This commit is contained in:
Pasha Tatashin 2025-05-09 08:29:28 +02:00 committed by Andrew Morton
parent 90eb270d8e
commit d82893c52a
1 changed files with 5 additions and 5 deletions
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10
kernel/fork.c
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@ -280,6 +280,11 @@ static int alloc_thread_stack_node(struct task_struct *tsk, int node)
if (!vm_area)
continue;
if (memcg_charge_kernel_stack(vm_area)) {
vfree(vm_area->addr);
return -ENOMEM;
}
/* Reset stack metadata. */
kasan_unpoison_range(vm_area->addr, THREAD_SIZE);
@ -288,11 +293,6 @@ static int alloc_thread_stack_node(struct task_struct *tsk, int node)
/* Clear stale pointers from reused stack. */
memset(stack, 0, THREAD_SIZE);
if (memcg_charge_kernel_stack(vm_area)) {
vfree(vm_area->addr);
return -ENOMEM;
}
tsk->stack_vm_area = vm_area;
tsk->stack = stack;
return 0;