From: Jens Axboe <axboe@kernel.dk> mainline inclusion from mainline-v6.3-rc1 commit a3df2e456c0f9db4cc7f2013eb0beb853945b937 bugzilla: https://gitee.com/openeuler/kernel/issues/IB7FJU Reference: https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?i... -------------------------------- We have BIO_FLAG_LAST in the enum for bio specific flags, but it's not used to check that we're not exceeding the size of them. Add such a check. Reviewed-by: Damien Le Moal <damien.lemoal@opensource.wdc.com> Signed-off-by: Jens Axboe <axboe@kernel.dk> Conflicts: block/bio.c [Commit 49d1ec8573f7 ("block: manage bio slab cache by xarray") remove bio_slabs/bio_slab_nr/bio_slab_max.] Signed-off-by: Li Lingfeng <lilingfeng3@huawei.com> Signed-off-by: Li Nan <linan122@huawei.com> --- block/bio.c | 2 ++ 1 file changed, 2 insertions(+) diff --git a/block/bio.c b/block/bio.c index 6e1d3b259f29..efd432594446 100644 --- a/block/bio.c +++ b/block/bio.c @@ -1628,6 +1628,8 @@ static int __init init_bio(void) if (!bio_slabs) panic("bio: can't allocate bios\n"); + BUILD_BUG_ON(BIO_FLAG_LAST > 8 * sizeof_field(struct bio, bi_flags)); + bio_integrity_init(); for (i = 0; i < ARRAY_SIZE(bvec_slabs); i++) { -- 2.39.2