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bcachefs: Fix heap overrun in bch2_fs_usage_read() XXX squash

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Signed-off-by: Kent Overstreet <kent.overstreet@gmail.com>
Signed-off-by: Kent Overstreet <kent.overstreet@linux.dev>
This commit is contained in:
Kent Overstreet 2021-04-13 10:30:58 -04:00 committed by Kent Overstreet
parent 423300e8fe
commit 319c130507
1 changed files with 2 additions and 2 deletions
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4
fs/bcachefs/buckets.c
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@ -224,7 +224,7 @@ u64 bch2_fs_usage_read_one(struct bch_fs *c, u64 *v)
struct bch_fs_usage_online *bch2_fs_usage_read(struct bch_fs *c)
{
struct bch_fs_usage_online *ret;
unsigned seq, i, v, u64s = fs_usage_u64s(c);
unsigned seq, i, v, u64s = fs_usage_u64s(c) + 1;
retry:
ret = kmalloc(u64s * sizeof(u64), GFP_NOFS);
if (unlikely(!ret))
@ -232,7 +232,7 @@ retry:
percpu_down_read(&c->mark_lock);
v = fs_usage_u64s(c);
v = fs_usage_u64s(c) + 1;
if (unlikely(u64s != v)) {
u64s = v;
percpu_up_read(&c->mark_lock);