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Re: [libvirt] [PATCH 2/2] nwfilter: fix error handling



On 11/30/12 13:51, Peter Krempa wrote:
On 11/30/12 13:09, Ján Tomko wrote:
Commit 4efde75f introduced a return in the cleanup path and removed
virNWFilterConfLayerShutdown.

Found by coverity:
Error: UNREACHABLE (CWE-561):
     libvirt-0.10.2/src/nwfilter/nwfilter_driver.c:259: unreachable: This
     code cannot be reached: "nwfilterDriverUnlock(driver...".
---
I wonder if the if (!privileged) check should be moved before driverState
allocation?
---
  src/nwfilter/nwfilter_driver.c |   11 +++++------
  1 files changed, 5 insertions(+), 6 deletions(-)

diff --git a/src/nwfilter/nwfilter_driver.c
b/src/nwfilter/nwfilter_driver.c
index a0ee4f1..cd185e2 100644
--- a/src/nwfilter/nwfilter_driver.c
+++ b/src/nwfilter/nwfilter_driver.c
@@ -174,8 +174,10 @@ nwfilterDriverStartup(bool privileged)
      sysbus = virDBusGetSystemBus();
  #endif /* HAVE_DBUS */

-    if (VIR_ALLOC(driverState) < 0)
-        goto alloc_err_exit;
+    if (VIR_ALLOC(driverState) < 0) {
+        virReportOOMError();
+        return -1;
+    }

      if (virMutexInit(&driverState->lock) < 0)
          goto err_free_driverstate;
@@ -247,10 +249,7 @@ error:
      nwfilterDriverUnlock(driverState);
      nwfilterDriverShutdown();

-alloc_err_exit:
-    return -1;

When you remove this hunk you cause any jump to the error label to fall
through all of the following labeled error cleanup sections.

Those sections are also called in nwfilterDriverShutdown(). I'm
wondering if the functions are safe to call even if the driver wasn't
initialized completely. In that case we might be just calling
nwfilterDriverShutdown() and get rid of the cleanup labels. If we're not
allowed to do that, the return statement has to stay there.

virNWFilterDHCPSnoopShutdown(void) doesn't look that it can be called without being initialized first, so you will need to either have to fix virNWFilterDHCPSnoopShutdown and make sure that other are callable even when not initialized, or you need to exit from the function at the point the label was before.


-
-    nwfilterDriverUnlock(driverState);
+    virNWFilterConfLayerShutdown();

  err_techdrivers_shutdown:
      virNWFilterTechDriversShutdown();


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