Re: [libvirt] [PATCH] storage: skip selinux cleanup when fd not available

When attempting to backport gluster pools to an older version where there is no VIR_STRDUP, I got a crash from calling strdup(,NULL). Rather than relying on the current else branch safely doing nothing when there is no fd, it is easier to just skip it. While at it, there's no need to explicitly set perms.label to NULL after a VIR_FREE(). * src/storage/storage_backend.c (virStorageBackendUpdateVolTargetInfoFD): Minor optimization. Signed-off-by: Eric Blake <eblake(a)redhat.com&gt; --- src/storage/storage_backend.c | 26 ++++++++++++-------------- 1 file changed, 12 insertions(+), 14 deletions(-) diff --git a/src/storage/storage_backend.c b/src/storage/storage_backend.c index bde39d6..b08d646 100644 --- a/src/storage/storage_backend.c +++ b/src/storage/storage_backend.c @@ -1383,28 +1383,26 @@ virStorageBackendUpdateVolTargetInfoFD(virStorageVolTargetPtr target, VIR_FREE(target->perms.label); #if WITH_SELINUX /* XXX: make this a security driver call */ - if (fd >= 0 && fgetfilecon_raw(fd, &filecon) == -1) { - if (errno != ENODATA && errno != ENOTSUP) { - virReportSystemError(errno, - _("cannot get file context of '%s'"), - target->path); - return -1; + if (fd >= 0) { + if (fgetfilecon_raw(fd, &filecon) == -1) { + if (errno != ENODATA && errno != ENOTSUP) { + virReportSystemError(errno, + _("cannot get file context of '%s'"), + target->path); + return -1; + } } else { - target->perms.label = NULL; - } - } else { - if (VIR_STRDUP(target->perms.label, filecon) < 0) { + if (VIR_STRDUP(target->perms.label, filecon) < 0) { + freecon(filecon); + return -1; + } freecon(filecon); - return -1; } - freecon(filecon); } -#else - target->perms.label = NULL; #endif return 0; }