Commit 90499ad0 authored by Pavel Begunkov's avatar Pavel Begunkov Committed by Jens Axboe
Browse files

io_uring: add build check for buf_index overflows 



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: default avatarPavel Begunkov <asml.silence@gmail.com>
Link: https://lore.kernel.org/r/787e8e1a17cea51ca6301426b1c4c4887b8bd676.1629920396.git.asml.silence@gmail.com


Signed-off-by: default avatarJens Axboe <axboe@kernel.dk>
parent b18a1a45

fs/io_uring.c

+4 −0
Original line number Diff line number Diff line
@@ -10493,6 +10493,10 @@ 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));