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activation: dso always defined for monitoring query

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Ensure 'dso' has always a defined (NULL) value,
and also ensure NULL 'dso' is not dereferenced.
This commit is contained in:
Zdenek Kabelac 2016-09-12 16:37:31 +02:00
parent 06c7220f78
commit b592ea5bbc
2 changed files with 3 additions and 2 deletions
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1
WHATS_NEW
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@ -1,5 +1,6 @@
Version 2.02.166 -
=====================================
Fix possible NULL pointer derefence when checking for monitoring.
Add lvmreport(7) man page.
Don't install lvmraid(7) man page when raid excluded. (2.02.165)
Report 0% as dirty (copy%) for cache without any used block.

4
lib/activate/activate.c
View File

@ -1707,7 +1707,7 @@ int monitor_dev_for_events(struct cmd_context *cmd, const struct logical_volume
uint32_t s;
static const struct lv_activate_opts zlaopts = { 0 };
struct lvinfo info;
const char *dso;
const char *dso = NULL;
int new_unmonitor;
if (!laopts)
@ -1855,7 +1855,7 @@ int monitor_dev_for_events(struct cmd_context *cmd, const struct logical_volume
} else {
if (!monitored)
log_verbose("%s already not monitored.", display_lvname(lv));
else if (*dso) {
else if (dso && *dso) {
/*
* Divert unmonitor away from code that depends on the new segment
* type instead of the existing one if it's changing.