[PATCH] net/qrtr: restrict user-controlled length in qrtr_tun_write_iter()

[Sabyrzhan Tasbolatov]

syzbot found WARNING in qrtr_tun_write_iter [1] when write_iter length
exceeds KMALLOC_MAX_SIZE causing order >= MAX_ORDER condition.

Additionally, there is no check for 0 length write.

[1]
WARNING: mm/page_alloc.c:5011
[..]
Call Trace:
 alloc_pages_current+0x18c/0x2a0 mm/mempolicy.c:2267
 alloc_pages include/linux/gfp.h:547 [inline]
 kmalloc_order+0x2e/0xb0 mm/slab_common.c:837
 kmalloc_order_trace+0x14/0x120 mm/slab_common.c:853
 kmalloc include/linux/slab.h:557 [inline]
 kzalloc include/linux/slab.h:682 [inline]
 qrtr_tun_write_iter+0x8a/0x180 net/qrtr/tun.c:83
 call_write_iter include/linux/fs.h:1901 [inline]

Reported-by: syzbot+c2a7e5c5211605a90...@syzkaller.appspotmail.com
Signed-off-by: Sabyrzhan Tasbolatov <snovit...@gmail.com>
---
 net/qrtr/tun.c | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/net/qrtr/tun.c b/net/qrtr/tun.c
index 15ce9b642b25..b238c40a9984 100644
--- a/net/qrtr/tun.c
+++ b/net/qrtr/tun.c
@@ -80,6 +80,12 @@ static ssize_t qrtr_tun_write_iter(struct kiocb *iocb, 
struct iov_iter *from)
        ssize_t ret;
        void *kbuf;
 
+       if (!len)
+               return -EINVAL;
+
+       if (len > KMALLOC_MAX_SIZE)
+               return -ENOMEM;
+
        kbuf = kzalloc(len, GFP_KERNEL);
        if (!kbuf)
                return -ENOMEM;
-- 
2.25.1