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io_uring: check for valid register opcode earlier 

[ Upstream commit 343190841a ]

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>
This commit is contained in:
Jens Axboe 2022-12-23 06:37:08 -07:00 committed by Greg Kroah-Hartman
parent 9c152189a7
commit 8b2de52126
1 changed files with 3 additions and 2 deletions
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5
io_uring/io_uring.c
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@ -3897,8 +3897,6 @@ 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;
@ -4054,6 +4052,9 @@ 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;