commit 55281a2c53b884d0c2bce31aee592faf20a28eed
author Peter Maydell <peter.maydell@linaro.org> Thu Dec 13 12:02:52 2018 +0000
committer Cornelia Huck <cohuck@redhat.com> Thu Dec 20 17:07:24 2018 +0100
tree 4b7886dd04456b95c83ef1ebeefd501aff6ba094
parent b72566a4ffaddbc0c0c1f6f5ee91b42ab13ff429

hw/s390/ccw.c: Don't take address of packed members

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 problem by using local copies of the PMCW and SCSW
struct fields in copy_schib_from_guest() and copy_schib_to_guest().

Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
Message-Id: <20181213120252.21697-1-peter.maydell@linaro.org>
Reviewed-by: Farhan Ali <alifm@linux.ibm.com>
Reviewed-by: Thomas Huth <thuth@redhat.com>
Signed-off-by: Cornelia Huck <cohuck@redhat.com>

hw/s390x/css.c

diff --git a/hw/s390x/css.c b/hw/s390x/css.c
index 04ec5cc..f92b046 100644
--- a/hw/s390x/css.c
+++ b/hw/s390x/css.c
@@ -1290,9 +1290,19 @@
 static void copy_schib_to_guest(SCHIB *dest, const SCHIB *src)
 {
     int i;
+    /*
+     * We copy the PMCW and SCSW in and out of local variables to
+     * avoid taking the address of members of a packed struct.
+     */
+    PMCW src_pmcw, dest_pmcw;
+    SCSW src_scsw, dest_scsw;
 
-    copy_pmcw_to_guest(&dest->pmcw, &src->pmcw);
-    copy_scsw_to_guest(&dest->scsw, &src->scsw);
+    src_pmcw = src->pmcw;
+    copy_pmcw_to_guest(&dest_pmcw, &src_pmcw);
+    dest->pmcw = dest_pmcw;
+    src_scsw = src->scsw;
+    copy_scsw_to_guest(&dest_scsw, &src_scsw);
+    dest->scsw = dest_scsw;
     dest->mba = cpu_to_be64(src->mba);
     for (i = 0; i < ARRAY_SIZE(dest->mda); i++) {
         dest->mda[i] = src->mda[i];
@@ -1339,9 +1349,19 @@
 static void copy_schib_from_guest(SCHIB *dest, const SCHIB *src)
 {
     int i;
+    /*
+     * We copy the PMCW and SCSW in and out of local variables to
+     * avoid taking the address of members of a packed struct.
+     */
+    PMCW src_pmcw, dest_pmcw;
+    SCSW src_scsw, dest_scsw;
 
-    copy_pmcw_from_guest(&dest->pmcw, &src->pmcw);
-    copy_scsw_from_guest(&dest->scsw, &src->scsw);
+    src_pmcw = src->pmcw;
+    copy_pmcw_from_guest(&dest_pmcw, &src_pmcw);
+    dest->pmcw = dest_pmcw;
+    src_scsw = src->scsw;
+    copy_scsw_from_guest(&dest_scsw, &src_scsw);
+    dest->scsw = dest_scsw;
     dest->mba = be64_to_cpu(src->mba);
     for (i = 0; i < ARRAY_SIZE(dest->mda); i++) {
         dest->mda[i] = src->mda[i];