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>
#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;
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;