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bcachefs: BCH_SB_LAYOUT_SIZE_BITS_MAX

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Define a constant for the max superblock size, to avoid a too-large
shift.

Reported-by: syzbot+a8b0fb419355c91dda7f@syzkaller.appspotmail.com
Signed-off-by: Kent Overstreet <kent.overstreet@linux.dev>
This commit is contained in:
Kent Overstreet 2024-05-06 09:10:29 -04:00
parent 88ab10186c
commit 71dac2482a
2 changed files with 3 additions and 1 deletions
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2
fs/bcachefs/bcachefs_format.h
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@ -903,6 +903,8 @@ unsigned bcachefs_metadata_required_upgrade_below = bcachefs_metadata_version_re
#define BCH_SB_SECTOR 8
#define BCH_SB_MEMBERS_MAX 64 /* XXX kill */
#define BCH_SB_LAYOUT_SIZE_BITS_MAX 16 /* 32 MB */
struct bch_sb_layout {
__uuid_t magic; /* bcachefs superblock UUID */
__u8 layout_type;

2
fs/bcachefs/super-io.c
View File

@ -649,7 +649,7 @@ static int read_one_super(struct bch_sb_handle *sb, u64 offset, struct printbuf
bytes = vstruct_bytes(sb->sb);
if (bytes > 512 << sb->sb->layout.sb_max_size_bits) {
if (bytes > 512ULL << min(BCH_SB_LAYOUT_SIZE_BITS_MAX, sb->sb->layout.sb_max_size_bits)) {
prt_printf(err, "Invalid superblock: too big (got %zu bytes, layout max %lu)",
bytes, 512UL << sb->sb->layout.sb_max_size_bits);
return -BCH_ERR_invalid_sb_too_big;