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block: turn the nr_iovecs argument to bio_alloc* into an unsigned short

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The bi_max_vecs and bi_vcnt fields are defined as unsigned short, so
don't allow passing larger values in.

Signed-off-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Jens Axboe <axboe@kernel.dk>
This commit is contained in:
Christoph Hellwig
2021-02-02 18:19:24 +01:00
committed by Jens Axboe
parent de76fd8930
commit 0f2e6ab851
2 changed files with 6 additions and 5 deletions
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block/bio.c
+2 -2
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@@ -407,7 +407,7 @@ static void punt_bios_to_rescuer(struct bio_set *bs)
*
* Returns: Pointer to new bio on success, NULL on failure.
*/
struct bio *bio_alloc_bioset(gfp_t gfp_mask, unsigned int nr_iovecs,
struct bio *bio_alloc_bioset(gfp_t gfp_mask, unsigned short nr_iovecs,
struct bio_set *bs)
{
gfp_t saved_gfp = gfp_mask;
@@ -493,7 +493,7 @@ EXPORT_SYMBOL(bio_alloc_bioset);
*
* Returns: Pointer to new bio on success, NULL on failure.
*/
struct bio *bio_kmalloc(gfp_t gfp_mask, unsigned int nr_iovecs)
struct bio *bio_kmalloc(gfp_t gfp_mask, unsigned short nr_iovecs)
{
struct bio *bio;