[Virtio-fs] [PATCH 1/2] tools/virtiofsd/buffer.c: check whether buf is NULL in fuse_bufvec_advance func

[Haotian Li]

In fuse_bufvec_advance func, calling fuse_bufvec_current func
may return NULL, so we should check whether buf is NULL before
using it.

Signed-off-by: Haotian Li <lihaotian9 at huawei.com>
Signed-off-by: Zhiqiang Liu <liuzhiqiang26 at huawei.com>
---
 tools/virtiofsd/buffer.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/tools/virtiofsd/buffer.c b/tools/virtiofsd/buffer.c
index 27c1377f22..c94993b936 100644
--- a/tools/virtiofsd/buffer.c
+++ b/tools/virtiofsd/buffer.c
@@ -246,6 +246,9 @@ static int fuse_bufvec_advance(struct fuse_bufvec *bufv, size_t len)
 {
     const struct fuse_buf *buf = fuse_bufvec_current(bufv);

+    if (!buf)
+        return 0;
+
     bufv->off += len;
     assert(bufv->off <= buf->size);
     if (bufv->off == buf->size) {
--