From: Huang Shijie sjhuang@iluvatar.ai
mainline inclusion from mainline-v5.12-rc1-dontuse commit 0e24465d3313832e82f8bd9ee2439da1367dd2e5 category: bugfix bugzilla: https://gitee.com/openeuler/kernel/issues/I7R8MI CVE: NA
Reference: https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?i...
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Just as bitmap_clear_ll(), change return type to unsigned long for bitmap_set_ll to avoid the possible overflow in future.
Link: https://lkml.kernel.org/r/20210105031644.2771-1-sjhuang@iluvatar.ai Signed-off-by: Huang Shijie sjhuang@iluvatar.ai Signed-off-by: Andrew Morton akpm@linux-foundation.org Signed-off-by: Linus Torvalds torvalds@linux-foundation.org Signed-off-by: Guo Mengqi guomengqi3@huawei.com --- lib/genalloc.c | 3 ++- 1 file changed, 2 insertions(+), 1 deletion(-)
diff --git a/lib/genalloc.c b/lib/genalloc.c index 0b8ee173cf3a..2f15b9de12c4 100644 --- a/lib/genalloc.c +++ b/lib/genalloc.c @@ -83,7 +83,8 @@ static int clear_bits_ll(unsigned long *addr, unsigned long mask_to_clear) * users set the same bit, one user will return remain bits, otherwise * return 0. */ -static int bitmap_set_ll(unsigned long *map, unsigned long start, unsigned long nr) +static unsigned long +bitmap_set_ll(unsigned long *map, unsigned long start, unsigned long nr) { unsigned long *p = map + BIT_WORD(start); const unsigned long size = start + nr;