fs/squashfs: fix potential integer overflows

The length of buffers used to read inode tables, directory tables, and
reading a file are calculated as: number of blocks * block size, and
such plain multiplication is prone to overflowing (thus unsafe).

Replace it by __builtin_mul_overflow, i.e. safe math.

Signed-off-by: Joao Marcos Costa <joaomarcos.costa@bootlin.com>
1 file changed