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bcachefs: fix bounds checks in bch2_bio_map()

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Signed-off-by: Kent Overstreet <kent.overstreet@linux.dev>
This commit is contained in:
Kent Overstreet 2018-11-03 20:19:04 -04:00 committed by Kent Overstreet
parent ac10a9611d
commit 636ad1d391
1 changed files with 3 additions and 1 deletions
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4
fs/bcachefs/util.c
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@ -529,15 +529,17 @@ void bch2_bio_map(struct bio *bio, void *base)
BUG_ON(!bio->bi_iter.bi_size);
BUG_ON(bio->bi_vcnt);
BUG_ON(!bio->bi_max_vecs);
bv->bv_offset = base ? offset_in_page(base) : 0;
goto start;
for (; size; bio->bi_vcnt++, bv++) {
BUG_ON(bio->bi_vcnt >= bio->bi_max_vecs);
bv->bv_offset = 0;
start: bv->bv_len = min_t(size_t, PAGE_SIZE - bv->bv_offset,
size);
BUG_ON(bio->bi_vcnt >= bio->bi_max_vecs);
if (base) {
bv->bv_page = is_vmalloc_addr(base)
? vmalloc_to_page(base)