io_uring/net: fix cleanup double free free_iov init

Having ->async_data doesn't mean it's initialised and previously we vere
relying on setting F_CLEANUP at the right moment. With zc sendmsg
though, we set F_CLEANUP early in prep when we alloc a notif and so we
may allocate async_data, fail in copy_msg_hdr() leaving
struct io_async_msghdr not initialised correctly but with F_CLEANUP
set, which causes a ->free_iov double free and probably other nastiness.

Always initialise ->free_iov. Also, now it might point to fast_iov when
fails, so avoid freeing it during cleanups.

Reported-by: syzbot+edfd15cd4246a3fc615a@syzkaller.appspotmail.com
Fixes: 493108d95f146 ("io_uring/net: zerocopy sendmsg")
Signed-off-by: Pavel Begunkov <asml.silence@gmail.com>
Signed-off-by: Jens Axboe <axboe@kernel.dk>

diff --git a/io_uring/net.c b/io_uring/net.c
index 2af5666..6b69eff 100644 (file)
--- a/io_uring/net.c
+++ b/io_uring/net.c
@@ -124,20 +124,22 @@ static struct io_async_msghdr *io_msg_alloc_async(struct io_kiocb *req,
 {
        struct io_ring_ctx *ctx = req->ctx;
        struct io_cache_entry *entry;
+       struct io_async_msghdr *hdr;
 
        if (!(issue_flags & IO_URING_F_UNLOCKED) &&
            (entry = io_alloc_cache_get(&ctx->netmsg_cache)) != NULL) {
-               struct io_async_msghdr *hdr;
-
                hdr = container_of(entry, struct io_async_msghdr, cache);
+               hdr->free_iov = NULL;
                req->flags |= REQ_F_ASYNC_DATA;
                req->async_data = hdr;
                return hdr;
        }
 
-       if (!io_alloc_async_data(req))
-               return req->async_data;
-
+       if (!io_alloc_async_data(req)) {
+               hdr = req->async_data;
+               hdr->free_iov = NULL;
+               return hdr;
+       }
        return NULL;
 }
 
@@ -192,7 +194,6 @@ int io_send_prep_async(struct io_kiocb *req)
        io = io_msg_alloc_async_prep(req);
        if (!io)
                return -ENOMEM;
-       io->free_iov = NULL;
        ret = move_addr_to_kernel(zc->addr, zc->addr_len, &io->addr);
        return ret;
 }
@@ -209,7 +210,6 @@ static int io_setup_async_addr(struct io_kiocb *req,
        io = io_msg_alloc_async(req, issue_flags);
        if (!io)
                return -ENOMEM;
-       io->free_iov = NULL;
        memcpy(&io->addr, addr_storage, sizeof(io->addr));
        return -EAGAIN;
 }
@@ -479,7 +479,6 @@ static int __io_compat_recvmsg_copy_hdr(struct io_kiocb *req,
 
                if (msg.msg_iovlen == 0) {
                        sr->len = 0;
-                       iomsg->free_iov = NULL;
                } else if (msg.msg_iovlen > 1) {
                        return -EINVAL;
                } else {
@@ -490,7 +489,6 @@ static int __io_compat_recvmsg_copy_hdr(struct io_kiocb *req,
                        if (clen < 0)
                                return -EINVAL;
                        sr->len = clen;
-                       iomsg->free_iov = NULL;
                }
 
                if (req->flags & REQ_F_APOLL_MULTISHOT) {
@@ -913,7 +911,9 @@ void io_send_zc_cleanup(struct io_kiocb *req)
 
        if (req_has_async_data(req)) {
                io = req->async_data;
-               kfree(io->free_iov);
+               /* might be ->fast_iov if *msg_copy_hdr failed */
+               if (io->free_iov != io->fast_iov)
+                       kfree(io->free_iov);
        }
        if (zc->notif) {
                zc->notif->flags |= REQ_F_CQE_SKIP;