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mm/vmalloc: bail out early on invalid page_shift in __vmap_pages_range_noflush()

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__vmap_pages_range_noflush() currently only warns when page_shift is
smaller than PAGE_SHIFT, then continues with the invalid shift.  Return
-EINVAL instead so the bogus argument is caught immediately.

Link: https://lore.kernel.org/20261004071639.119857-1-jiangwenxiaomi@gmail.com
Signed-off-by: Wen Jiang <jiangwen6@xiaomi.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Suggested-by: Uladzislau Rezki (Sony) <urezki@gmail.com>
Reviewed-by: Barry Song <baohua@kernel.org>
Reviewed-by: Uladzislau Rezki (Sony) <urezki@gmail.com>
Reviewed-by: Vishal Moola (Fractile) <vishal.moola@gmail.com>
Cc: Dev Jain <dev.jain@arm.com>
This commit is contained in:
Wen Jiang 2026-10-04 15:16:39 +08:00 committed by Andrew Morton
parent 29f8fcb55c
commit bf033d0436
1 changed files with 2 additions and 1 deletions
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3
mm/vmalloc.c
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@ -684,7 +684,8 @@ int __vmap_pages_range_noflush(unsigned long addr, unsigned long end,
{
unsigned int i, nr = (end - addr) >> PAGE_SHIFT;
WARN_ON(page_shift < PAGE_SHIFT);
if (WARN_ON_ONCE(page_shift < PAGE_SHIFT))
return -EINVAL;
if (!IS_ENABLED(CONFIG_HAVE_ARCH_HUGE_VMALLOC) ||
page_shift == PAGE_SHIFT)