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Fix potential null ptr deref in 'origin_from_cow'

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return NULL rather than segfaulting if lv->snapshot is not set
This commit is contained in:
Jonathan Earl Brassow 2011-07-19 16:23:52 +00:00
parent 9796bd4db6
commit aa6599e687
1 changed files with 3 additions and 1 deletions
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4
lib/metadata/snapshot_manip.c
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@ -81,7 +81,9 @@ struct lv_segment *find_cow(const struct logical_volume *lv)
/* Given a cow LV, return its origin */ /* Given a cow LV, return its origin */
struct logical_volume *origin_from_cow(const struct logical_volume *lv) struct logical_volume *origin_from_cow(const struct logical_volume *lv)
{ {
return lv->snapshot->origin; if (lv->snapshot)
return lv->snapshot->origin;
return NULL;
} }
void init_snapshot_seg(struct lv_segment *seg, struct logical_volume *origin, void init_snapshot_seg(struct lv_segment *seg, struct logical_volume *origin,