From: Jens Axboe axboe@kernel.dk
[ Upstream commit 343190841a1f22b96996d9f8cfab902a4d1bfd0e ]
We only check the register opcode value inside the restricted ring section, move it into the main io_uring_register() function instead and check it up front.
Signed-off-by: Jens Axboe axboe@kernel.dk Signed-off-by: Sasha Levin sashal@kernel.org --- io_uring/io_uring.c | 5 +++-- 1 file changed, 3 insertions(+), 2 deletions(-)
diff --git a/io_uring/io_uring.c b/io_uring/io_uring.c index b8a39be3bcb4..cfcf1d415521 100644 --- a/io_uring/io_uring.c +++ b/io_uring/io_uring.c @@ -3725,8 +3725,6 @@ static int __io_uring_register(struct io_ring_ctx *ctx, unsigned opcode, return -EEXIST;
if (ctx->restricted) { - if (opcode >= IORING_REGISTER_LAST) - return -EINVAL; opcode = array_index_nospec(opcode, IORING_REGISTER_LAST); if (!test_bit(opcode, ctx->restrictions.register_op)) return -EACCES; @@ -3882,6 +3880,9 @@ SYSCALL_DEFINE4(io_uring_register, unsigned int, fd, unsigned int, opcode, long ret = -EBADF; struct fd f;
+ if (opcode >= IORING_REGISTER_LAST) + return -EINVAL; + f = fdget(fd); if (!f.file) return -EBADF;