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| author | Konstantin Komarov <almaz.alexandrovich@paragon-software.com> | 2023-06-30 16:25:25 +0400 |
|---|---|---|
| committer | Konstantin Komarov <almaz.alexandrovich@paragon-software.com> | 2023-09-28 15:03:58 +0300 |
| commit | 91a4b1ee78cb100b19b70f077c247f211110348f (patch) | |
| tree | 50a848f86ccc0d15bba4a26c2b2db6b980ccaa67 /fs/ntfs3 | |
| parent | bfbe5b31caa74ab97f1784fe9ade5f45e0d3de91 (diff) | |
| download | linux-91a4b1ee78cb100b19b70f077c247f211110348f.tar.gz | |
fs/ntfs3: Fix shift-out-of-bounds in ntfs_fill_super
Reported-by: syzbot+478c1bf0e6bf4a8f3a04@syzkaller.appspotmail.com
Signed-off-by: Konstantin Komarov <almaz.alexandrovich@paragon-software.com>
Diffstat (limited to 'fs/ntfs3')
| -rw-r--r-- | fs/ntfs3/ntfs_fs.h | 2 | ||||
| -rw-r--r-- | fs/ntfs3/super.c | 26 |
2 files changed, 22 insertions, 6 deletions
diff --git a/fs/ntfs3/ntfs_fs.h b/fs/ntfs3/ntfs_fs.h index 629403ede6e5f..788567d71d939 100644 --- a/fs/ntfs3/ntfs_fs.h +++ b/fs/ntfs3/ntfs_fs.h @@ -42,9 +42,11 @@ enum utf16_endian; #define MINUS_ONE_T ((size_t)(-1)) /* Biggest MFT / smallest cluster */ #define MAXIMUM_BYTES_PER_MFT 4096 +#define MAXIMUM_SHIFT_BYTES_PER_MFT 12 #define NTFS_BLOCKS_PER_MFT_RECORD (MAXIMUM_BYTES_PER_MFT / 512) #define MAXIMUM_BYTES_PER_INDEX 4096 +#define MAXIMUM_SHIFT_BYTES_PER_INDEX 12 #define NTFS_BLOCKS_PER_INODE (MAXIMUM_BYTES_PER_INDEX / 512) /* NTFS specific error code when fixup failed. */ diff --git a/fs/ntfs3/super.c b/fs/ntfs3/super.c index ea4e218c3f755..f78c67452b2a8 100644 --- a/fs/ntfs3/super.c +++ b/fs/ntfs3/super.c @@ -899,9 +899,17 @@ check_boot: goto out; } - sbi->record_size = record_size = - boot->record_size < 0 ? 1 << (-boot->record_size) : - (u32)boot->record_size << cluster_bits; + if (boot->record_size >= 0) { + record_size = (u32)boot->record_size << cluster_bits; + } else if (-boot->record_size <= MAXIMUM_SHIFT_BYTES_PER_MFT) { + record_size = 1u << (-boot->record_size); + } else { + ntfs_err(sb, "%s: invalid record size %d.", hint, + boot->record_size); + goto out; + } + + sbi->record_size = record_size; sbi->record_bits = blksize_bits(record_size); sbi->attr_size_tr = (5 * record_size >> 4); // ~320 bytes @@ -918,9 +926,15 @@ check_boot: goto out; } - sbi->index_size = boot->index_size < 0 ? - 1u << (-boot->index_size) : - (u32)boot->index_size << cluster_bits; + if (boot->index_size >= 0) { + sbi->index_size = (u32)boot->index_size << cluster_bits; + } else if (-boot->index_size <= MAXIMUM_SHIFT_BYTES_PER_INDEX) { + sbi->index_size = 1u << (-boot->index_size); + } else { + ntfs_err(sb, "%s: invalid index size %d.", hint, + boot->index_size); + goto out; + } /* Check index record size. */ if (sbi->index_size < SECTOR_SIZE || !is_power_of_2(sbi->index_size)) { |