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bcachefs: Fix shift overflow in read_one_super()

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Reported-by: syzbot+9f74cb4006b83e2a3df1@syzkaller.appspotmail.com
Signed-off-by: Kent Overstreet <kent.overstreet@linux.dev>
This commit is contained in:
Kent Overstreet 2024-06-17 09:20:41 -04:00
parent 3727ca5604
commit d406545613
1 changed files with 4 additions and 3 deletions
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7
fs/bcachefs/super-io.c
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@ -649,9 +649,10 @@ static int read_one_super(struct bch_sb_handle *sb, u64 offset, struct printbuf
bytes = vstruct_bytes(sb->sb);
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);
u64 sb_size = 512ULL << min(BCH_SB_LAYOUT_SIZE_BITS_MAX, sb->sb->layout.sb_max_size_bits);
if (bytes > sb_size) {
prt_printf(err, "Invalid superblock: too big (got %zu bytes, layout max %llu)",
bytes, sb_size);
return -BCH_ERR_invalid_sb_too_big;
}