Re: [libvirt] [PATCH v2] security_selinux: Fix crash in virSecuritySELinuxRestoreFileLabel

virSecuritySELinuxRestoreFileLabel should never be called with NULL path add check before call this function in case of causeing libvirtd crash https://bugzilla.redhat.com/show_bug.cgi?id=1300532 Signed-off-by: Shanzhi Yu <shyu(a)redhat.com&gt; --- src/security/security_selinux.c | 25 +++++++++++++++++-------- 1 file changed, 17 insertions(+), 8 deletions(-)

diff --git a/src/security/security_selinux.c b/src/security/security_selinux.c index 9e98635..77e55a3 100644 --- a/src/security/security_selinux.c +++ b/src/security/security_selinux.c @@ -1098,7 +1098,8 @@ virSecuritySELinuxRestoreInputLabel(virSecurityManagerPtr mgr, switch ((virDomainInputType) input->type) { case VIR_DOMAIN_INPUT_TYPE_PASSTHROUGH: - rc = virSecuritySELinuxRestoreFileLabel(mgr, input->source.evdev); + if (input->source.evdev) + rc = virSecuritySELinuxRestoreFileLabel(mgr, input->source.evdev); break; case VIR_DOMAIN_INPUT_TYPE_MOUSE: @@ -1171,7 +1172,9 @@ virSecuritySELinuxRestoreTPMFileLabelInt(virSecurityManagerPtr mgr, switch (tpm->type) { case VIR_DOMAIN_TPM_TYPE_PASSTHROUGH: tpmdev = tpm->data.passthrough.source.data.file.path; - rc = virSecuritySELinuxRestoreFileLabel(mgr, tpmdev); + + if (tpmdev) + rc = virSecuritySELinuxRestoreFileLabel(mgr, tpmdev); if ((cancel_path = virTPMCreateCancelPath(tpmdev)) != NULL) { if (virSecuritySELinuxRestoreFileLabel(mgr, cancel_path) < 0) @@ -1722,7 +1725,9 @@ virSecuritySELinuxRestoreHostdevCapsLabel(virSecurityManagerPtr mgr, if (VIR_STRDUP(path, dev->source.caps.u.storage.block) < 0) return -1; } - ret = virSecuritySELinuxRestoreFileLabel(mgr, path); + if (path) + ret = virSecuritySELinuxRestoreFileLabel(mgr, path); + VIR_FREE(path); break; } @@ -1736,7 +1741,8 @@ virSecuritySELinuxRestoreHostdevCapsLabel(virSecurityManagerPtr mgr, if (VIR_STRDUP(path, dev->source.caps.u.misc.chardev) < 0) return -1; } - ret = virSecuritySELinuxRestoreFileLabel(mgr, path); + if (path) + ret = virSecuritySELinuxRestoreFileLabel(mgr, path); VIR_FREE(path); break; } @@ -1876,13 +1882,15 @@ virSecuritySELinuxRestoreChardevLabel(virSecurityManagerPtr mgr, switch (dev_source->type) { case VIR_DOMAIN_CHR_TYPE_DEV: case VIR_DOMAIN_CHR_TYPE_FILE: - if (virSecuritySELinuxRestoreFileLabel(mgr, dev_source->data.file.path) < 0) - goto done; + if (dev_source->data.file.path) { + if (virSecuritySELinuxRestoreFileLabel(mgr, dev_source->data.file.path) < 0) + goto done; + } ret = 0; break; case VIR_DOMAIN_CHR_TYPE_UNIX: - if (!dev_source->data.nix.listen) { + if (!dev_source->data.nix.listen && dev_source->data.file.path) { if (virSecuritySELinuxRestoreFileLabel(mgr, dev_source->data.file.path) < 0) goto done; } @@ -1898,7 +1906,8 @@ virSecuritySELinuxRestoreChardevLabel(virSecurityManagerPtr mgr, (virSecuritySELinuxRestoreFileLabel(mgr, in) < 0)) { goto done; } - } else if (virSecuritySELinuxRestoreFileLabel(mgr, dev_source->data.file.path) < 0) { + } else if (dev_source->data.file.path && + virSecuritySELinuxRestoreFileLabel(mgr, dev_source->data.file.path) < 0) { goto done; } ret = 0;