unimore/kernel-hacking-2024-linux-steffo
unimore/kernel-hacking-2024-linux-steffo
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bcachefs: Fix unlocked access to c->disk_sb.sb in bch2_replicas_entry_validate()

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Signed-off-by: Kent Overstreet <kent.overstreet@linux.dev>
This commit is contained in:
Kent Overstreet 2024-09-25 18:17:31 -04:00
parent 9104fc1928
commit 49fd90b2cc
3 changed files with 16 additions and 6 deletions
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2
fs/bcachefs/journal_io.c
View file

@ -605,7 +605,7 @@ static int journal_entry_data_usage_validate(struct bch_fs *c,
goto out;
}
if (journal_entry_err_on(bch2_replicas_entry_validate(&u->r, c->disk_sb.sb, &err),
if (journal_entry_err_on(bch2_replicas_entry_validate(&u->r, c, &err),
c, version, jset, entry,
journal_entry_data_usage_bad_size,
"invalid journal entry usage: %s", err.buf)) {

18
fs/bcachefs/replicas.c
View file

@ -66,9 +66,9 @@ void bch2_replicas_entry_to_text(struct printbuf *out,
prt_printf(out, "]");
}
int bch2_replicas_entry_validate(struct bch_replicas_entry_v1 *r,
struct bch_sb *sb,
struct printbuf *err)
static int bch2_replicas_entry_validate_locked(struct bch_replicas_entry_v1 *r,
struct bch_sb *sb,
struct printbuf *err)
{
if (!r->nr_devs) {
prt_printf(err, "no devices in entry ");
@ -94,6 +94,16 @@ int bch2_replicas_entry_validate(struct bch_replicas_entry_v1 *r,
return -BCH_ERR_invalid_replicas_entry;
}
int bch2_replicas_entry_validate(struct bch_replicas_entry_v1 *r,
struct bch_fs *c,
struct printbuf *err)
{
mutex_lock(&c->sb_lock);
int ret = bch2_replicas_entry_validate_locked(r, c->disk_sb.sb, err);
mutex_unlock(&c->sb_lock);
return ret;
}
void bch2_cpu_replicas_to_text(struct printbuf *out,
struct bch_replicas_cpu *r)
{
@ -676,7 +686,7 @@ static int bch2_cpu_replicas_validate(struct bch_replicas_cpu *cpu_r,
struct bch_replicas_entry_v1 *e =
cpu_replicas_entry(cpu_r, i);
int ret = bch2_replicas_entry_validate(e, sb, err);
int ret = bch2_replicas_entry_validate_locked(e, sb, err);
if (ret)
return ret;

2
fs/bcachefs/replicas.h
View file

@ -10,7 +10,7 @@ void bch2_replicas_entry_sort(struct bch_replicas_entry_v1 *);
void bch2_replicas_entry_to_text(struct printbuf *,
struct bch_replicas_entry_v1 *);
int bch2_replicas_entry_validate(struct bch_replicas_entry_v1 *,
struct bch_sb *, struct printbuf *);
struct bch_fs *, struct printbuf *);
void bch2_cpu_replicas_to_text(struct printbuf *, struct bch_replicas_cpu *);
static inline struct bch_replicas_entry_v1 *