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bcachefs: Fix a memory splat

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In __bch2_sb_field_resize, when a field's old a new size was 0, we were
doing an invalid write just past the end of the superblock.

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 2019-12-18 17:34:36 -05:00 committed by Kent Overstreet
parent 22502ac23a
commit 187c71f6ab
1 changed files with 3 additions and 1 deletions
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4
fs/bcachefs/super-io.c
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@ -54,7 +54,9 @@ static struct bch_sb_field *__bch2_sb_field_resize(struct bch_sb_handle *sb,
BUG_ON(get_order(__vstruct_bytes(struct bch_sb, sb_u64s)) >
sb->page_order);
if (!f) {
if (!f && !u64s) {
/* nothing to do: */
} else if (!f) {
f = vstruct_last(sb->sb);
memset(f, 0, sizeof(u64) * u64s);
f->u64s = cpu_to_le32(u64s);