STREQ_NULLABLE returns true if both parameters are NULL. And that's not what we want here. We just want to skop comparing source nodes that don't have that info set. The function wouldn't make much sense with nodeName == NULL, so we don't need to check that. Moreover, the function's declaration uses ATTRIBUDE_NONNULL for nodeName, which not only means that function expects the parameter not to be NULL, but actually tells the compiler that it can optimize out the NULL checks. That way it could end up calling strcmp on NULL (either nodeformat or nodebacking). GCC figures this out if libvirt is compiled with lv_cv_static_analysis=yes, unfortunately not everyone uses that. Signed-off-by: Martin Kletzander <mkletzan(a)redhat.com&gt; --- src/util/virstoragefile.c | 4 ++-- 1 file changed, 2 insertions(+), 2 deletions(-) diff --git a/src/util/virstoragefile.c b/src/util/virstoragefile.c index 3bcb69bf6206..0ac707962102 100644 --- a/src/util/virstoragefile.c +++ b/src/util/virstoragefile.c @@ -3809,8 +3809,8 @@ virStorageSourceFindByNodeName(virStorageSourcePtr top, *index = 0; for (tmp = top; tmp; tmp = tmp->backingStore) { - if (STREQ_NULLABLE(tmp->nodeformat, nodeName) || - STREQ_NULLABLE(tmp->nodebacking, nodeName)) + if ((tmp->nodeformat && STREQ(tmp->nodeformat, nodeName)) || + (tmp->nodebacking && STREQ(tmp->nodebacking, nodeName))) return tmp; if (index) -- 2.12.1