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block: fix folio leak in bio_iov_iter_bounce_read()

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If iov_iter_extract_bvecs() returns an error or zero bytes extracted,
then the folio allocated is leaked on return. Ensure it's put before
returning.

Fixes: 8dd5e7c75d ("block: add helpers to bounce buffer an iov_iter into bios")
Signed-off-by: Jens Axboe <axboe@kernel.dk>
This commit is contained in:
Jens Axboe
2026-02-12 04:07:41 -07:00
parent 5b88af7113
commit 5991bfa3f8
1 changed files with 3 additions and 1 deletions
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4
block/bio.c
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@@ -1382,8 +1382,10 @@ static int bio_iov_iter_bounce_read(struct bio *bio, struct iov_iter *iter)
ret = iov_iter_extract_bvecs(iter, bio->bi_io_vec + 1, len, ret = iov_iter_extract_bvecs(iter, bio->bi_io_vec + 1, len,
&bio->bi_vcnt, bio->bi_max_vecs - 1, 0); &bio->bi_vcnt, bio->bi_max_vecs - 1, 0);
if (ret <= 0) { if (ret <= 0) {
if (!bio->bi_vcnt) if (!bio->bi_vcnt) {
folio_put(folio);
return ret; return ret;
}
break; break;
} }
len -= ret; len -= ret;