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Re: [libvirt] [PATCH] qemu: avoid memory leaks



On 08/02/2011 02:48 PM, Laine Stump wrote:
On 08/02/2011 04:10 PM, Eric Blake wrote:
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.


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


Shouldn't this be virDomainChrDefFree(chr)?



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;
}


If you never hit the if condition, disk will be left pointing to one of
the disks in def, and will be freed during cleanup. I think you want to
set disk = NULL after this look is finished as well, don't you? (Either
that, or just use a different variable).

Both good points.  I'm squashing this in to create v2.

diff --git i/src/qemu/qemu_command.c w/src/qemu/qemu_command.c
index c638420..194f3ff 100644
--- i/src/qemu/qemu_command.c
+++ w/src/qemu/qemu_command.c
@@ -6522,7 +6522,7 @@ virDomainDefPtr qemuParseCommandLine(virCapsPtr caps,
                     goto no_memory;

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

@@ -6552,11 +6552,9 @@ virDomainDefPtr qemuParseCommandLine(virCapsPtr caps,
             char *hosts, *port, *saveptr = NULL, *token;
             virDomainDiskDefPtr first_rbd_disk = NULL;
             for (i = 0 ; i < def->ndisks ; 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;
+                if (def->disks[i]->type == VIR_DOMAIN_DISK_TYPE_NETWORK &&
+ def->disks[i]->protocol == VIR_DOMAIN_DISK_PROTOCOL_RBD) {
+                    first_rbd_disk = def->disks[i];
                     break;
                 }
             }


--
Eric Blake   eblake redhat com    +1-801-349-2682
Libvirt virtualization library http://libvirt.org


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