From: Dennis Zhou Date: Thu, 21 Feb 2019 23:54:11 +0000 (-0800) Subject: percpu: do not search past bitmap when allocating an area X-Git-Url: http://git.maquefel.me/?a=commitdiff_plain;h=8c43004af01635cc9fbb11031d070e5e0d327ef2;p=linux.git percpu: do not search past bitmap when allocating an area pcpu_find_block_fit() guarantees that a fit is found within PCPU_BITMAP_BLOCK_BITS. Iteration is used to determine the first fit as it compares against the block's contig_hint. This can lead to incorrectly scanning past the end of the bitmap. The behavior was okay given the check after for bit_off >= end and the correctness of the hints from pcpu_find_block_fit(). This patch fixes this by bounding the end offset by the number of bits in a chunk. Signed-off-by: Dennis Zhou Reviewed-by: Peng Fan --- diff --git a/mm/percpu.c b/mm/percpu.c index 938f295a60d4d..769b7583975b2 100644 --- a/mm/percpu.c +++ b/mm/percpu.c @@ -988,7 +988,8 @@ static int pcpu_alloc_area(struct pcpu_chunk *chunk, int alloc_bits, /* * Search to find a fit. */ - end = start + alloc_bits + PCPU_BITMAP_BLOCK_BITS; + end = min_t(int, start + alloc_bits + PCPU_BITMAP_BLOCK_BITS, + pcpu_chunk_map_bits(chunk)); bit_off = bitmap_find_next_zero_area(chunk->alloc_map, end, start, alloc_bits, align_mask); if (bit_off >= end)