From: Jens Axboe <axboe@xxxxxxxxx>
commit 990a4de57e44f4f4cfc33c90d2ec5d285b7c8342 upstream.
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@xxxxxxxxx>
Fixes: 4c17a496a7a0 ("io_uring/net: fix cleanup double free free_iov init")
Cc: stable@xxxxxxxxxxxxxxx
Signed-off-by: Jens Axboe <axboe@xxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
io_uring/net.c | 1 +
1 file changed, 1 insertion(+)
--- a/io_uring/net.c
+++ b/io_uring/net.c
@@ -479,6 +479,7 @@ static int __io_compat_recvmsg_copy_hdr(
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) {
