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io_uring: verify resv is 0 in ringfd register/unregister

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Only allow resv field to be 0 in struct io_uring_rsrc_update user
arguments.

Fixes: e7a6c00dc7 ("io_uring: add support for registering ring file descriptors")
Signed-off-by: Dylan Yudaken <dylany@fb.com>
Link: https://lore.kernel.org/r/20220412163042.2788062-4-dylany@fb.com
Signed-off-by: Jens Axboe <axboe@kernel.dk>
This commit is contained in:
Dylan Yudaken 2022-04-12 09:30:41 -07:00 committed by Jens Axboe
parent d8a3ba9c14
commit 6fb53cf8ff
1 changed files with 6 additions and 1 deletions
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7
fs/io_uring.c
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@ -10533,6 +10533,11 @@ static int io_ringfd_register(struct io_ring_ctx *ctx, void __user *__arg,
break;
}
if (reg.resv) {
ret = -EINVAL;
break;
}
if (reg.offset == -1U) {
start = 0;
end = IO_RINGFD_REG_MAX;
@ -10579,7 +10584,7 @@ static int io_ringfd_unregister(struct io_ring_ctx *ctx, void __user *__arg,
ret = -EFAULT;
break;
}
if (reg.offset >= IO_RINGFD_REG_MAX) {
if (reg.resv || reg.offset >= IO_RINGFD_REG_MAX) {
ret = -EINVAL;
break;
}