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bcache: Fix a null ptr deref in journal replay

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Signed-off-by: Kent Overstreet <kmo@daterainc.com>
This commit is contained in:
Kent Overstreet 2014-02-24 19:55:28 -08:00
parent 4fa03402cd
commit 65ddf45a31
1 changed files with 5 additions and 1 deletions
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6
drivers/md/bcache/journal.c
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@ -287,9 +287,13 @@ void bch_journal_mark(struct cache_set *c, struct list_head *list)
k < bset_bkey_last(&i->j); k < bset_bkey_last(&i->j);
k = bkey_next(k)) { k = bkey_next(k)) {
unsigned j; unsigned j;
struct bucket *g;
for (j = 0; j < KEY_PTRS(k); j++) { for (j = 0; j < KEY_PTRS(k); j++) {
struct bucket *g = PTR_BUCKET(c, k, j); if (!ptr_available(c, k, j))
continue;
g = PTR_BUCKET(c, k, j);
atomic_inc(&g->pin); atomic_inc(&g->pin);
if (g->prio == BTREE_PRIO && if (g->prio == BTREE_PRIO &&