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qemu: fix crash with shared disks

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Commit f36a94f introduced a double free on all success paths
in qemuSharedDeviceEntryInsert.

Only call qemuSharedDeviceEntryFree on the error path and
set entry to NULL before jumping there if the entry already
is in the hash table.

https://bugzilla.redhat.com/show_bug.cgi?id=1142722
This commit is contained in:
Ján Tomko 2014-09-17 12:36:21 +02:00
parent 434dd55194
commit 540ee87249
2 changed files with 13 additions and 16 deletions
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26
src/qemu/qemu_conf.c
View File

@ -1011,38 +1011,36 @@ qemuSharedDeviceEntryInsert(virQEMUDriverPtr driver,
const char *name)
{
qemuSharedDeviceEntry *entry = NULL;
int ret = -1;
if ((entry = virHashLookup(driver->sharedDevices, key))) {
/* Nothing to do if the shared scsi host device is already
* recorded in the table.
*/
if (qemuSharedDeviceEntryDomainExists(entry, name, NULL)) {
ret = 0;
goto cleanup;
if (!qemuSharedDeviceEntryDomainExists(entry, name, NULL)) {
if (VIR_EXPAND_N(entry->domains, entry->ref, 1) < 0 ||
VIR_STRDUP(entry->domains[entry->ref - 1], name) < 0) {
/* entry is owned by the hash table here */
entry = NULL;
goto error;
}
}
if (VIR_EXPAND_N(entry->domains, entry->ref, 1) < 0 ||
VIR_STRDUP(entry->domains[entry->ref - 1], name) < 0)
goto cleanup;
} else {
if (VIR_ALLOC(entry) < 0 ||
VIR_ALLOC_N(entry->domains, 1) < 0 ||
VIR_STRDUP(entry->domains[0], name) < 0)
goto cleanup;
goto error;
entry->ref = 1;
if (virHashAddEntry(driver->sharedDevices, key, entry))
goto cleanup;
goto error;
}
ret = 0;
return 0;
cleanup:
error:
qemuSharedDeviceEntryFree(entry, NULL);
return ret;
return -1;
}

3
src/qemu/qemu_conf.h
View File

@ -294,8 +294,7 @@ bool qemuSharedDeviceEntryDomainExists(qemuSharedDeviceEntryPtr entry,
char *qemuGetSharedDeviceKey(const char *disk_path)
ATTRIBUTE_NONNULL(1);
void qemuSharedDeviceEntryFree(void *payload, const void *name)
ATTRIBUTE_NONNULL(1);
void qemuSharedDeviceEntryFree(void *payload, const void *name);
int qemuAddSharedDevice(virQEMUDriverPtr driver,
virDomainDeviceDefPtr dev,