From f15e006b831384aaec4b4f13265c0dff88ef09dd Mon Sep 17 00:00:00 2001 From: Dominique Martinet Date: Tue, 22 Nov 2022 09:06:56 +0900 Subject: 9p/xen: do not memcpy header into req->rc while 'h' is packed and can be assumed to match the request payload, req->rc is a struct p9_fcall which is not packed and that memcpy could be wrong. Fix this by copying each fields individually instead. Reported-by: Christian Schoenebeck Reviewed-by: Christian Schoenebeck Suggested-by: Stefano Stabellini Reviewed-by: Stefano Stabellini Link: https://lkml.kernel.org/r/alpine.DEB.2.22.394.2211211454540.1049131@ubuntu-linux-20-04-desktop Link: https://lkml.kernel.org/r/20221122001025.119121-1-asmadeus@codewreck.org Signed-off-by: Dominique Martinet --- net/9p/trans_xen.c | 4 +++- 1 file changed, 3 insertions(+), 1 deletion(-) (limited to 'net/9p') diff --git a/net/9p/trans_xen.c b/net/9p/trans_xen.c index aaa5fd364691..de2d2ca8819a 100644 --- a/net/9p/trans_xen.c +++ b/net/9p/trans_xen.c @@ -216,7 +216,9 @@ static void p9_xen_response(struct work_struct *work) goto recv_error; } - memcpy(&req->rc, &h, sizeof(h)); + req->rc.size = h.size; + req->rc.id = h.id; + req->rc.tag = h.tag; req->rc.offset = 0; masked_cons = xen_9pfs_mask(cons, XEN_9PFS_RING_SIZE(ring)); -- cgit v1.2.3