From 313c27aee9facd8826baa2e79403dd610926434c Mon Sep 17 00:00:00 2001 From: Kent Overstreet Date: Wed, 24 Jul 2013 18:14:44 -0700 Subject: [PATCH] bcache: Fix bch_ptr_bad() Previously, bch_ptr_bad() could return false when there was a pointer to a nonexistant device... it only filtered out keys with PTR_CHECK_DEV pointers. This behaviour was intended for multiple cache device support; for that, just because the device for one of the pointers has gone away doesn't mean we want to filter out the rest of the pointers. But we don't yet explicitly filter/check individual pointers, so without that this behaviour was wrong - a corrupt bkey with a bad device pointer could cause us to deref a bad pointer. Doh. Signed-off-by: Kent Overstreet --- drivers/md/bcache/bset.c | 67 ++++++++++++++++++++-------------------- 1 file changed, 33 insertions(+), 34 deletions(-) diff --git a/drivers/md/bcache/bset.c b/drivers/md/bcache/bset.c index 7ff23bbe2b07..b791cf167d7a 100644 --- a/drivers/md/bcache/bset.c +++ b/drivers/md/bcache/bset.c @@ -116,47 +116,46 @@ bool bch_ptr_bad(struct btree *b, const struct bkey *k) bch_ptr_invalid(b, k)) return true; - if (KEY_PTRS(k) && PTR_DEV(k, 0) == PTR_CHECK_DEV) - return true; + for (i = 0; i < KEY_PTRS(k); i++) { + if (!ptr_available(b->c, k, i)) + return true; - for (i = 0; i < KEY_PTRS(k); i++) - if (ptr_available(b->c, k, i)) { - g = PTR_BUCKET(b->c, k, i); - stale = ptr_stale(b->c, k, i); + g = PTR_BUCKET(b->c, k, i); + stale = ptr_stale(b->c, k, i); - btree_bug_on(stale > 96, b, - "key too stale: %i, need_gc %u", - stale, b->c->need_gc); + btree_bug_on(stale > 96, b, + "key too stale: %i, need_gc %u", + stale, b->c->need_gc); - btree_bug_on(stale && KEY_DIRTY(k) && KEY_SIZE(k), - b, "stale dirty pointer"); + btree_bug_on(stale && KEY_DIRTY(k) && KEY_SIZE(k), + b, "stale dirty pointer"); - if (stale) - return true; + if (stale) + return true; #ifdef CONFIG_BCACHE_EDEBUG - if (!mutex_trylock(&b->c->bucket_lock)) - continue; - - if (b->level) { - if (KEY_DIRTY(k) || - g->prio != BTREE_PRIO || - (b->c->gc_mark_valid && - GC_MARK(g) != GC_MARK_METADATA)) - goto bug; - - } else { - if (g->prio == BTREE_PRIO) - goto bug; - - if (KEY_DIRTY(k) && - b->c->gc_mark_valid && - GC_MARK(g) != GC_MARK_DIRTY) - goto bug; - } - mutex_unlock(&b->c->bucket_lock); -#endif + if (!mutex_trylock(&b->c->bucket_lock)) + continue; + + if (b->level) { + if (KEY_DIRTY(k) || + g->prio != BTREE_PRIO || + (b->c->gc_mark_valid && + GC_MARK(g) != GC_MARK_METADATA)) + goto bug; + + } else { + if (g->prio == BTREE_PRIO) + goto bug; + + if (KEY_DIRTY(k) && + b->c->gc_mark_valid && + GC_MARK(g) != GC_MARK_DIRTY) + goto bug; } + mutex_unlock(&b->c->bucket_lock); +#endif + } return false; #ifdef CONFIG_BCACHE_EDEBUG -- 2.39.5