Re: [PATCH] Fix squashfs failing to load sparse files

On Mon, Nov 23, 2020 at 03:40:03PM +1300, Campbell Suter wrote:

SquashFS supports sprase blocks in files - that is, if a given block is composed only of zeros, it's not written to the output file to save space and it's on-disk length field is set to zero to indicate that.

Previously the squashfs driver did not recognise that, and would attempt to read and decompress a zero-sized block, which obviously failed.

The following command may be used to create a file for testing:

cat <(dd if=/dev/urandom of=/dev/stdout bs=1M count=1) \ <(dd if=/dev/zero of=/dev/stdout bs=1M count=1) \ <(dd if=/dev/urandom of=/dev/stdout bs=1k count=200) >test_file

Signed-off-by: Campbell Suter campbell@snapit.group

Applied to u-boot/master, thanks!