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From 901c005299b0316bbca7bc190de56f6c7a2a9880 Mon Sep 17 00:00:00 2001
From: "Dr. David Alan Gilbert" <dgilbert@redhat.com>
Date: Tue, 3 Mar 2020 18:43:11 +0000
Subject: [PATCH 15/18] virtiofsd: do_read missing NULL check
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RH-Author: Dr. David Alan Gilbert <dgilbert@redhat.com>
Message-id: <20200303184314.155564-5-dgilbert@redhat.com>
Patchwork-id: 94127
O-Subject: [RHEL-AV-8.2.0 qemu-kvm PATCH 4/7] virtiofsd: do_read missing NULL check
Bugzilla: 1797064
RH-Acked-by: Stefan Hajnoczi <stefanha@redhat.com>
RH-Acked-by: Sergio Lopez Pascual <slp@redhat.com>
RH-Acked-by: Ján Tomko <jtomko@redhat.com>

From: "Dr. David Alan Gilbert" <dgilbert@redhat.com>

Missing a NULL check if the argument fetch fails.

Fixes: Coverity CID 1413119
Signed-off-by: Dr. David Alan Gilbert <dgilbert@redhat.com>
Reviewed-by: Philippe Mathieu-Daudé <philmd@redhat.com>
Reviewed-by: Stefan Hajnoczi <stefanha@redhat.com>
(cherry picked from commit 99ce9a7e60fd12b213b985343ff8fcc172de59fd)
Signed-off-by: Danilo C. L. de Paula <ddepaula@redhat.com>
---
 tools/virtiofsd/fuse_lowlevel.c | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/tools/virtiofsd/fuse_lowlevel.c b/tools/virtiofsd/fuse_lowlevel.c
index 01c418a..704c036 100644
--- a/tools/virtiofsd/fuse_lowlevel.c
+++ b/tools/virtiofsd/fuse_lowlevel.c
@@ -1116,6 +1116,10 @@ static void do_read(fuse_req_t req, fuse_ino_t nodeid,
         struct fuse_file_info fi;
 
         arg = fuse_mbuf_iter_advance(iter, sizeof(*arg));
+        if (!arg) {
+            fuse_reply_err(req, EINVAL);
+            return;
+        }
 
         memset(&fi, 0, sizeof(fi));
         fi.fh = arg->fh;
-- 
1.8.3.1