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[PULL,13/27] block/vpc: Don't take address of fields in packed structs

Message ID 20190201163518.31157-14-kwolf@redhat.com
State Accepted
Commit 0dbaaa7981e92a6b629b1cf0056dcafadd6ee8a5
Headers show
Series None | expand

Commit Message

Kevin Wolf Feb. 1, 2019, 4:35 p.m. UTC 
From: Peter Maydell <peter.maydell@linaro.org>


Taking the address of a field in a packed struct is a bad idea, because
it might not be actually aligned enough for that pointer type (and
thus cause a crash on dereference on some host architectures). Newer
versions of clang warn about this. Avoid the bug by generating the
UUID into a local variable which is definitely safely aligned and
then copying it into place.

Signed-off-by: Peter Maydell <peter.maydell@linaro.org>

Signed-off-by: Kevin Wolf <kwolf@redhat.com>

---
 block/vpc.c | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

-- 
2.20.1
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Patch

diff --git a/block/vpc.c b/block/vpc.c
index d886465b7e..52ab717642 100644
--- a/block/vpc.c
+++ b/block/vpc.c
@@ -979,6 +979,7 @@  static int coroutine_fn vpc_co_create(BlockdevCreateOptions *opts,
     int64_t total_size;
     int disk_type;
     int ret = -EIO;
+    QemuUUID uuid;
 
     assert(opts->driver == BLOCKDEV_DRIVER_VPC);
     vpc_opts = &opts->u.vpc;
@@ -1062,7 +1063,8 @@  static int coroutine_fn vpc_co_create(BlockdevCreateOptions *opts,
 
     footer->type = cpu_to_be32(disk_type);
 
-    qemu_uuid_generate(&footer->uuid);
+    qemu_uuid_generate(&uuid);
+    footer->uuid = uuid;
 
     footer->checksum = cpu_to_be32(vpc_checksum(buf, HEADER_SIZE));