summaryrefslogtreecommitdiff
path: root/io_uring/kbuf.c
diff options
context:
space:
mode:
authorDylan Yudaken <dylany@fb.com>2022-06-30 02:12:20 -0700
committerJens Axboe <axboe@kernel.dk>2022-07-24 18:39:16 -0600
commitb8c015598c8ef9195b8a2a5089e275c4f64ca999 (patch)
tree3bfe11619a9637eab9265ee91462eb60fb84618c /io_uring/kbuf.c
parent6e73dffbb93cb8797cd4e42e98d837edf0f1a967 (diff)
io_uring: allow 0 length for buffer select
If user gives 0 for length, we can set it from the available buffer size. Signed-off-by: Dylan Yudaken <dylany@fb.com> Link: https://lore.kernel.org/r/20220630091231.1456789-2-dylany@fb.com Signed-off-by: Jens Axboe <axboe@kernel.dk>
Diffstat (limited to 'io_uring/kbuf.c')
-rw-r--r--io_uring/kbuf.c4
1 files changed, 2 insertions, 2 deletions
diff --git a/io_uring/kbuf.c b/io_uring/kbuf.c
index 5e00f16e89b8..e538fa7cb727 100644
--- a/io_uring/kbuf.c
+++ b/io_uring/kbuf.c
@@ -115,7 +115,7 @@ static void __user *io_provided_buffer_select(struct io_kiocb *req, size_t *len,
kbuf = list_first_entry(&bl->buf_list, struct io_buffer, list);
list_del(&kbuf->list);
- if (*len > kbuf->len)
+ if (*len == 0 || *len > kbuf->len)
*len = kbuf->len;
req->flags |= REQ_F_BUFFER_SELECTED;
req->kbuf = kbuf;
@@ -145,7 +145,7 @@ static void __user *io_ring_buffer_select(struct io_kiocb *req, size_t *len,
buf = page_address(bl->buf_pages[index]);
buf += off;
}
- if (*len > buf->len)
+ if (*len == 0 || *len > buf->len)
*len = buf->len;
req->flags |= REQ_F_BUFFER_RING;
req->buf_list = bl;