crash while optimizing image, index out of range

[matthiaskrgr]

file:
https://gitlab.com/freedroid/freedroid-src/blob/master/data/gui/level_editor/waypoint_cursor.png

RUST_BACKTRACE=1  /home/matthias/vcs/github/oxipng/target/debug/oxipng -o 6 --zm 1-9 waypoint_cursor.png

Processing: waypoint_cursor.png
    65x35 pixels, PNG format
    4 bits/pixel, 8 colors in palette
    IDAT size = 296 bytes
    File size = 455 bytes
Reducing image to 4 bits/pixel, 7 colors in palette
Trying: 1944 combinations
Found better combination:
    zc = 8  zm = 7  zs = 0  f = 0        291 bytes
    IDAT size = 291 bytes (5 bytes decrease)
    file size = 447 bytes (8 bytes = 1.76% decrease)
thread 'main' panicked at 'index 24 out of range for slice of length 21', /checkout/src/libcore/slice/mod.rs:748:4
stack backtrace:
   0: std::sys::imp::backtrace::tracing::imp::unwind_backtrace
             at /checkout/src/libstd/sys/unix/backtrace/tracing/gcc_s.rs:49
   1: std::sys_common::backtrace::_print
             at /checkout/src/libstd/sys_common/backtrace.rs:71
   2: std::panicking::default_hook::{{closure}}
             at /checkout/src/libstd/sys_common/backtrace.rs:60
             at /checkout/src/libstd/panicking.rs:381
   3: std::panicking::default_hook
             at /checkout/src/libstd/panicking.rs:397
   4: std::panicking::rust_panic_with_hook
             at /checkout/src/libstd/panicking.rs:577
   5: std::panicking::begin_panic
             at /checkout/src/libstd/panicking.rs:538
   6: std::panicking::begin_panic_fmt
             at /checkout/src/libstd/panicking.rs:522
   7: rust_begin_unwind
             at /checkout/src/libstd/panicking.rs:498
   8: core::panicking::panic_fmt
             at /checkout/src/libcore/panicking.rs:71
   9: core::slice::slice_index_len_fail
             at /checkout/src/libcore/slice/mod.rs:748
  10: png::decoder::expand_paletted
             at /checkout/src/libcore/ops/arith.rs:0
  11: <png::decoder::Reader<R>>::next_interlaced_row
             at /home/matthias/.cargo/registry/src/git.luolix.top-1ecc6299db9ec823/png-0.8.0/src/decoder/mod.rs:273
  12: oxipng::optimize_png
             at /home/matthias/.cargo/registry/src/git.luolix.top-1ecc6299db9ec823/png-0.8.0/src/decoder/mod.rs:238
             at /home/matthias/.cargo/registry/src/git.luolix.top-1ecc6299db9ec823/png-0.8.0/src/decoder/mod.rs:229
             at /home/matthias/.cargo/registry/src/git.luolix.top-1ecc6299db9ec823/image-0.14.0/./src/png.rs:84
             at /home/matthias/.cargo/registry/src/git.luolix.top-1ecc6299db9ec823/image-0.14.0/./src/dynimage.rs:470
             at /home/matthias/.cargo/registry/src/git.luolix.top-1ecc6299db9ec823/image-0.14.0/./src/dynimage.rs:622
             at /home/matthias/.cargo/registry/src/git.luolix.top-1ecc6299db9ec823/image-0.14.0/./src/dynimage.rs:672
             at src/lib.rs:627
  13: oxipng::optimize
             at src/lib.rs:302
  14: oxipng::handle_optimization
             at src/main.rs:267
  15: oxipng::main
             at src/main.rs:234
  16: __rust_maybe_catch_panic
             at /checkout/src/libpanic_unwind/lib.rs:99
  17: std::rt::lang_start
             at /checkout/src/libstd/panicking.rs:459
             at /checkout/src/libstd/panic.rs:361
             at /checkout/src/libstd/rt.rs:59
  18: __libc_start_main
  19: _start

rustc 1.22.0-nightly (d93036a04 2017-09-07)

[shssoichiro]

Thanks for reporting this. I'll investigate and post a bugfix hopefully within a few days.