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io_uring/net: ensure compat import handlers clear free_iov

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If we're not allocating the vectors because the count is below
UIO_FASTIOV, we still do need to properly clear ->free_iov to prevent
an erronous free of on-stack data.

Reported-by: Jiri Slaby <jirislaby@gmail.com>
Fixes: 4c17a496a7 ("io_uring/net: fix cleanup double free free_iov init")
Cc: stable@vger.kernel.org
Signed-off-by: Jens Axboe <axboe@kernel.dk>
This commit is contained in:
Jens Axboe 2022-12-19 07:28:26 -07:00
parent 35d90f95cf
commit 990a4de57e
1 changed files with 1 additions and 0 deletions
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io_uring/net.c
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@ -494,6 +494,7 @@ static int __io_compat_recvmsg_copy_hdr(struct io_kiocb *req,
if (req->flags & REQ_F_BUFFER_SELECT) {
compat_ssize_t clen;
iomsg->free_iov = NULL;
if (msg.msg_iovlen == 0) {
sr->len = 0;
} else if (msg.msg_iovlen > 1) {