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-rw-r--r--block/bio.c14
1 files changed, 9 insertions, 5 deletions
diff --git a/block/bio.c b/block/bio.c
index 095382c4315c..cbf2db1ed284 100644
--- a/block/bio.c
+++ b/block/bio.c
@@ -1266,6 +1266,7 @@ struct bio *bio_map_user_iov(struct request_queue *q,
int ret, offset;
struct iov_iter i;
struct iovec iov;
+ struct bio_vec *bvec;
iov_for_each(iov, i, *iter) {
unsigned long uaddr = (unsigned long) iov.iov_base;
@@ -1310,7 +1311,12 @@ struct bio *bio_map_user_iov(struct request_queue *q,
ret = get_user_pages_fast(uaddr, local_nr_pages,
(iter->type & WRITE) != WRITE,
&pages[cur_page]);
- if (ret < local_nr_pages) {
+ if (unlikely(ret < local_nr_pages)) {
+ for (j = cur_page; j < page_limit; j++) {
+ if (!pages[j])
+ break;
+ put_page(pages[j]);
+ }
ret = -EFAULT;
goto out_unmap;
}
@@ -1372,10 +1378,8 @@ struct bio *bio_map_user_iov(struct request_queue *q,
return bio;
out_unmap:
- for (j = 0; j < nr_pages; j++) {
- if (!pages[j])
- break;
- put_page(pages[j]);
+ bio_for_each_segment_all(bvec, bio, j) {
+ put_page(bvec->bv_page);
}
out:
kfree(pages);