[libvirt] [PATCH] qemu: avoid memory leaks

[Eric Blake]

Quite a few leaks detected by coverity.  For chr, the leaks were
close enough to the allocations to plug in place; for disk, the
leaks were separated from the allocation by enough other lines with
intermediate failure cases that I refactored the cleanup instead.

* src/qemu/qemu_command.c (qemuParseCommandLine): Plug leaks.
---
 src/qemu/qemu_command.c |   23 ++++++++++++++++-------
 1 files changed, 16 insertions(+), 7 deletions(-)

diff --git a/src/qemu/qemu_command.c b/src/qemu/qemu_command.c
index 6a2e2ae..c638420 100644
--- a/src/qemu/qemu_command.c
+++ b/src/qemu/qemu_command.c
@@ -5938,6 +5938,7 @@ virDomainDefPtr qemuParseCommandLine(virCapsPtr caps,
     int video = VIR_DOMAIN_VIDEO_TYPE_CIRRUS;
     int nvirtiodisk = 0;
     qemuDomainCmdlineDefPtr cmd = NULL;
+    virDomainDiskDefPtr disk = NULL;

     if (pidfile)
         *pidfile = NULL;
@@ -6124,7 +6125,6 @@ virDomainDefPtr qemuParseCommandLine(virCapsPtr caps,
                    STRPREFIX(arg, "-fd") ||
                    STREQ(arg, "-cdrom")) {
             WANT_VALUE();
-            virDomainDiskDefPtr disk;
             if (VIR_ALLOC(disk) < 0)
                 goto no_memory;

@@ -6239,6 +6239,7 @@ virDomainDefPtr qemuParseCommandLine(virCapsPtr caps,
                 goto no_memory;
             }
             def->disks[def->ndisks++] = disk;
+            disk = NULL;
         } else if (STREQ(arg, "-no-acpi")) {
             def->features &= ~(1 << VIR_DOMAIN_FEATURE_ACPI);
         } else if (STREQ(arg, "-no-reboot")) {
@@ -6307,8 +6308,10 @@ virDomainDefPtr qemuParseCommandLine(virCapsPtr caps,
                 if (!(chr = virDomainChrDefNew()))
                     goto error;

-                if (qemuParseCommandLineChr(&chr->source, val) < 0)
+                if (qemuParseCommandLineChr(&chr->source, val) < 0) {
+                    virDomainChrDefFree(chr);
                     goto error;
+                }
                 if (VIR_REALLOC_N(def->serials, def->nserials+1) < 0) {
                     virDomainChrDefFree(chr);
                     goto no_memory;
@@ -6325,8 +6328,10 @@ virDomainDefPtr qemuParseCommandLine(virCapsPtr caps,
                 if (!(chr = virDomainChrDefNew()))
                     goto error;

-                if (qemuParseCommandLineChr(&chr->source, val) < 0)
+                if (qemuParseCommandLineChr(&chr->source, val) < 0) {
+                    virDomainChrDefFree(chr);
                     goto error;
+                }
                 if (VIR_REALLOC_N(def->parallels, def->nparallels+1) < 0) {
                     virDomainChrDefFree(chr);
                     goto no_memory;
@@ -6353,7 +6358,6 @@ virDomainDefPtr qemuParseCommandLine(virCapsPtr caps,
                 }
                 def->inputs[def->ninputs++] = input;
             } else if (STRPREFIX(val, "disk:")) {
-                virDomainDiskDefPtr disk;
                 if (VIR_ALLOC(disk) < 0)
                     goto no_memory;
                 disk->src = strdup(val + strlen("disk:"));
@@ -6376,6 +6380,7 @@ virDomainDefPtr qemuParseCommandLine(virCapsPtr caps,
                     goto no_memory;
                 }
                 def->disks[def->ndisks++] = disk;
+                disk = NULL;
             } else {
                 virDomainHostdevDefPtr hostdev;
                 if (!(hostdev = qemuParseCommandLineUSB(val)))
@@ -6399,7 +6404,6 @@ virDomainDefPtr qemuParseCommandLine(virCapsPtr caps,
                 def->nets[def->nnets++] = net;
             }
         } else if (STREQ(arg, "-drive")) {
-            virDomainDiskDefPtr disk;
             WANT_VALUE();
             if (!(disk = qemuParseCommandLineDisk(caps, val, nvirtiodisk)))
                 goto error;
@@ -6408,6 +6412,7 @@ virDomainDefPtr qemuParseCommandLine(virCapsPtr caps,
                 goto no_memory;
             }
             def->disks[def->ndisks++] = disk;
+            disk = NULL;

             if (disk->bus == VIR_DOMAIN_DISK_BUS_VIRTIO)
                 nvirtiodisk++;
@@ -6516,8 +6521,10 @@ virDomainDefPtr qemuParseCommandLine(virCapsPtr caps,
                 if (VIR_ALLOC(chr) < 0)
                     goto no_memory;

-                if (qemuParseCommandLineChr(chr, val) < 0)
+                if (qemuParseCommandLineChr(chr, val) < 0) {
+                    VIR_FREE(chr);
                     goto error;
+                }

                 *monConfig = chr;
             }
@@ -6545,10 +6552,11 @@ virDomainDefPtr qemuParseCommandLine(virCapsPtr caps,
             char *hosts, *port, *saveptr = NULL, *token;
             virDomainDiskDefPtr first_rbd_disk = NULL;
             for (i = 0 ; i < def->ndisks ; i++) {
-                virDomainDiskDefPtr disk = def->disks[i];
+                disk = def->disks[i];
                 if (disk->type == VIR_DOMAIN_DISK_TYPE_NETWORK &&
                     disk->protocol == VIR_DOMAIN_DISK_PROTOCOL_RBD) {
                     first_rbd_disk = disk;
+                    disk = NULL;
                     break;
                 }
             }
@@ -6676,6 +6684,7 @@ virDomainDefPtr qemuParseCommandLine(virCapsPtr caps,
 no_memory:
     virReportOOMError();
 error:
+    VIR_FREE(disk);
     VIR_FREE(cmd);
     virDomainDefFree(def);
     VIR_FREE(nics);
-- 
1.7.4.4