req->buf_index is u16 and so we rely on registered buffers indexes fitting into it. Add a build check, so when the upper limit for the number of buffers is lifted we get a compliation fail but not lurking problems. Signed-off-by: Pavel Begunkov <asml.silence@xxxxxxxxx> --- fs/io_uring.c | 4 ++++ 1 file changed, 4 insertions(+) diff --git a/fs/io_uring.c b/fs/io_uring.c index 712605fd04c2..6112318a770c 100644 --- a/fs/io_uring.c +++ b/fs/io_uring.c @@ -10450,6 +10450,10 @@ static int __init io_uring_init(void) sizeof(struct io_uring_rsrc_update)); BUILD_BUG_ON(sizeof(struct io_uring_rsrc_update) > sizeof(struct io_uring_rsrc_update2)); + + /* ->buf_index is u16 */ + BUILD_BUG_ON(IORING_MAX_REG_BUFFERS >= (1u << 16)); + /* should fit into one byte */ BUILD_BUG_ON(SQE_VALID_FLAGS >= (1 << 8)); -- 2.32.0
