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[Qemu-devel] [PULL 2/2] tests/virtio-9p-test: Don't call le*_to_cpus on

From: Greg Kurz
Subject: [Qemu-devel] [PULL 2/2] tests/virtio-9p-test: Don't call le*_to_cpus on fields of packed struct
Date: Tue, 28 Mar 2017 10:46:34 +0200

From: Peter Maydell <address@hidden>

For a packed struct like 'P9Hdr' the fields within it may not be
aligned as much as the natural alignment for their types.  This means
it is not valid to pass the address of such a field to a function
like le32_to_cpus() which operate on uint32_t* and assume alignment.
Doing this results in a SIGBUS on hosts like SPARC which have strict
alignment requirements.

Use ldl_le_p() instead, which is specified to correctly handle
unaligned pointers.

Signed-off-by: Peter Maydell <address@hidden>
Reviewed-by: Greg Kurz <address@hidden>
Signed-off-by: Greg Kurz <address@hidden>
 tests/virtio-9p-test.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/tests/virtio-9p-test.c b/tests/virtio-9p-test.c
index 43a1ad813fda..ad33d963876f 100644
--- a/tests/virtio-9p-test.c
+++ b/tests/virtio-9p-test.c
@@ -256,8 +256,8 @@ static void v9fs_req_recv(P9Req *req, uint8_t id)
         qvirtio_wait_queue_isr(v9p->dev, v9p->vq, 1000 * 1000);
         v9fs_memread(req, &hdr, 7);
-        le32_to_cpus(&hdr.size);
-        le16_to_cpus(&hdr.tag);
+        hdr.size = ldl_le_p(&hdr.size);
+        hdr.tag = lduw_le_p(&hdr.tag);
         if (hdr.size >= 7) {

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