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Code Issues Releases Wiki Activity

bcache: Fix a journal replay bug

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journal replay wansn't validating pointers with bch_extent_invalid() before
derefing, fixed

Signed-off-by: Kent Overstreet <kmo@daterainc.com>
This commit is contained in:
Kent Overstreet 2014-04-10 17:58:49 -07:00
parent 5b1016e62f
commit 9aa61a992a
3 changed files with 19 additions and 11 deletions
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13
drivers/md/bcache/extents.c
View File

@ -474,9 +474,8 @@ out:
return false;
}
static bool bch_extent_invalid(struct btree_keys *bk, const struct bkey *k)
bool __bch_extent_invalid(struct cache_set *c, const struct bkey *k)
{
struct btree *b = container_of(bk, struct btree, keys);
char buf[80];
if (!KEY_SIZE(k))
@ -485,16 +484,22 @@ static bool bch_extent_invalid(struct btree_keys *bk, const struct bkey *k)
if (KEY_SIZE(k) > KEY_OFFSET(k))
goto bad;
if (__ptr_invalid(b->c, k))
if (__ptr_invalid(c, k))
goto bad;
return false;
bad:
bch_extent_to_text(buf, sizeof(buf), k);
cache_bug(b->c, "spotted extent %s: %s", buf, bch_ptr_status(b->c, k));
cache_bug(c, "spotted extent %s: %s", buf, bch_ptr_status(c, k));
return true;
}
static bool bch_extent_invalid(struct btree_keys *bk, const struct bkey *k)
{
struct btree *b = container_of(bk, struct btree, keys);
return __bch_extent_invalid(b->c, k);
}
static bool bch_extent_bad_expensive(struct btree *b, const struct bkey *k,
unsigned ptr)
{

1
drivers/md/bcache/extents.h
View File

@ -9,5 +9,6 @@ struct cache_set;
void bch_extent_to_text(char *, size_t, const struct bkey *);
bool __bch_btree_ptr_invalid(struct cache_set *, const struct bkey *);
bool __bch_extent_invalid(struct cache_set *, const struct bkey *);
#endif /* _BCACHE_EXTENTS_H */

16
drivers/md/bcache/journal.c
View File

@ -7,6 +7,7 @@
#include "bcache.h"
#include "btree.h"
#include "debug.h"
#include "extents.h"
#include <trace/events/bcache.h>
@ -291,15 +292,16 @@ void bch_journal_mark(struct cache_set *c, struct list_head *list)
for (k = i->j.start;
k < bset_bkey_last(&i->j);
k = bkey_next(k)) {
unsigned j;
k = bkey_next(k))
if (!__bch_extent_invalid(c, k)) {
unsigned j;
for (j = 0; j < KEY_PTRS(k); j++)
if (ptr_available(c, k, j))
atomic_inc(&PTR_BUCKET(c, k, j)->pin);
for (j = 0; j < KEY_PTRS(k); j++)
if (ptr_available(c, k, j))
atomic_inc(&PTR_BUCKET(c, k, j)->pin);
bch_initial_mark_key(c, 0, k);
}
bch_initial_mark_key(c, 0, k);
}
}
}