Re: [libvirt] [PATCH] Fix DMI uuid parsing.

valgrind was complaining that virUUIDParse was depending on an uninitialized value. Indeed it was; virSetHostUUIDStr() didn't initialize the dmiuuid buffer to 0's, meaning that anything after the string read from /sys was uninitialized. Clear out the dmiuuid buffer before use, and make sure to always leave a \0 at the end. Signed-off-by: Chris Lalancette <clalance(a)redhat.com&gt; --- src/util/uuid.c | 3 ++- 1 files changed, 2 insertions(+), 1 deletions(-) diff --git a/src/util/uuid.c b/src/util/uuid.c index f188148..9cafc2a 100644 --- a/src/util/uuid.c +++ b/src/util/uuid.c @@ -286,7 +286,8 @@ virSetHostUUIDStr(const char *uuid) return EEXIST; if (!uuid) { - if (!getDMISystemUUID(dmiuuid, sizeof(dmiuuid))) { + memset(dmiuuid, 0, sizeof(dmiuuid)); + if (!getDMISystemUUID(dmiuuid, sizeof(dmiuuid) - 1)) { if (!virUUIDParse(dmiuuid, host_uuid)) return 0; }