Big endian machines (at least the one I have access to) cannot mount f2fs filesystems anymore. This is with Linux 4.14.89 but I suspect that 4.9.144 (and later) is affected as well.
commit 0cfe75c5b01199 ("f2fs: enhance sanity_check_raw_super() to avoid potential overflows") treats the "block_count" from struct f2fs_super_block as 32-bit little endian value instead of a 64-bit little endian value.
I tested this fix on top of Linux 4.14.49 but it seems that all stable and mainline kernel versions are affected: - 4.9.144 and later because 0cfe75c5b01199 was backported there - 4.14.86 and later because 0cfe75c5b01199 was backported there - 4.19 - 4.20-rcX
changes since v1 at [0]: - change the printk format for block_count from "%u" to "%llu" (thanks to "kbuild test robot" for spotting this) - added Chao Yu's reviewed by
[0] https://lore.kernel.org/patchwork/cover/1027285/
Martin Blumenstingl (1): f2fs: fix validation of the block count in sanity_check_raw_super
fs/f2fs/super.c | 6 +++--- 1 file changed, 3 insertions(+), 3 deletions(-)