md/raid10: check slab-out-of-bounds in md_bitmap_get_counter

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[ Upstream commit 301867b1c1 ]

If we write a large number to md/bitmap_set_bits, md_bitmap_checkpage()
will return -EINVAL because 'page >= bitmap->pages', but the return value
was not checked immediately in md_bitmap_get_counter() in order to set
*blocks value and slab-out-of-bounds occurs.

Move check of 'page >= bitmap->pages' to md_bitmap_get_counter() and
return directly if true.

Fixes: ef42567335 ("md/bitmap: optimise scanning of empty bitmaps.")
Signed-off-by: Li Nan <linan122@huawei.com>
Reviewed-by: Yu Kuai <yukuai3@huawei.com>
Signed-off-by: Song Liu <song@kernel.org>
Link: https://lore.kernel.org/r/20230515134808.3936750-2-linan666@huaweicloud.com
Signed-off-by: Sasha Levin <sashal@kernel.org>

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Li Nan 2023-05-15 21:48:05 +08:00 • committed by Greg Kroah-Hartman

parent 2ed9a89192

commit bea301c046

1 changed files with 9 additions and 8 deletions

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drivers/md/md-bitmap.c

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