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migration: Check for ID length 

The qdev id of a device can be huge if it's on the end of a chain
of bridges; in reality such chains shouldn't occur but they can
be made to by chaining PCIe bridges together.

The migration format has a number of 256 character long format
limits; check we don't hit them (we already use pstrcat/cpy but
that just protects us from buffer overruns, we fairly quickly
hit an assert).

Signed-off-by: Dr. David Alan Gilbert <dgilbert@redhat.com>
Reviewed-by: Juan Quintela <quintela@redhat.com>
Message-Id: <20170202125956.21942-3-dgilbert@redhat.com>
Signed-off-by: Juan Quintela <quintela@redhat.com>
This commit is contained in:
Dr. David Alan Gilbert 2017-02-02 12:59:55 +00:00 committed by Juan Quintela
parent bc5c4f2196
commit 581f08bac2
2 changed files with 18 additions and 5 deletions
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2
include/migration/vmstate.h
View File

@ -985,12 +985,14 @@ void vmstate_save_state(QEMUFile *f, const VMStateDescription *vmsd,
bool vmstate_save_needed(const VMStateDescription *vmsd, void *opaque);
/* Returns: 0 on success, -1 on failure */
int vmstate_register_with_alias_id(DeviceState *dev, int instance_id,
const VMStateDescription *vmsd,
void *base, int alias_id,
int required_for_version,
Error **errp);
/* Returns: 0 on success, -1 on failure */
static inline int vmstate_register(DeviceState *dev, int instance_id,
const VMStateDescription *vmsd,
void *opaque)

21
migration/savevm.c
View File

@ -590,8 +590,14 @@ int register_savevm_live(DeviceState *dev,
if (dev) {
char *id = qdev_get_dev_path(dev);
if (id) {
pstrcpy(se->idstr, sizeof(se->idstr), id);
pstrcat(se->idstr, sizeof(se->idstr), "/");
if (snprintf(se->idstr, sizeof(se->idstr), "%s/", id) >=
sizeof(se->idstr)) {
error_report("Path too long for VMState (%s)", id);
g_free(id);
g_free(se);
return -1;
}
g_free(id);
se->compat = g_new0(CompatEntry, 1);
@ -674,9 +680,14 @@ int vmstate_register_with_alias_id(DeviceState *dev, int instance_id,
if (dev) {
char *id = qdev_get_dev_path(dev);
if (id) {
pstrcpy(se->idstr, sizeof(se->idstr), id);
pstrcat(se->idstr, sizeof(se->idstr), "/");
g_free(id);
if (snprintf(se->idstr, sizeof(se->idstr), "%s/", id) >=
sizeof(se->idstr)) {
error_setg(errp, "Path too long for VMState (%s)", id);
g_free(id);
g_free(se);
return -1;
}
se->compat = g_new0(CompatEntry, 1);
pstrcpy(se->compat->idstr, sizeof(se->compat->idstr), vmsd->name);