Memory leak has detected in malloc_stub.c:45:20

[optionGo]

Hi, we have detected a memory leak in the rpl_malloc of malloc_stub.c

[optionGo]

Besides, we have created a PoC of it and the reproduce step is :
./img2sixel -h 50% -r lanczos3 -w 300px $PoC

=================================================================
==17326==ERROR: LeakSanitizer: detected memory leaks

Direct leak of 4500 byte(s) in 1 object(s) allocated from:
    #0 0x498b9d in __interceptor_malloc (/root/option/libsixel/build_asan/bin/img2sixel+0x498b9d)
    #1 0x4cdab7 in rpl_malloc /root/option/libsixel/converters/malloc_stub.c:45:20
    #2 0x4dca67 in sixel_allocator_malloc /root/option/libsixel/src/allocator.c:162:12
    #3 0x4f7136 in sixel_frame_resize /root/option/libsixel/src/frame.c:567:37
    #4 0x4d8b7f in sixel_encoder_do_resize /root/option/libsixel/src/encoder.c:712:18
    #5 0x4d7587 in sixel_encoder_encode_frame /root/option/libsixel/src/encoder.c:1039:18
    #6 0x4d6f30 in load_image_callback /root/option/libsixel/src/encoder.c:1752:12
    #7 0x54217e in load_gif /root/option/libsixel/src/fromgif.c:680:22
    #8 0x501cc6 in load_with_builtin /root/option/libsixel/src/loader.c:948:18
    #9 0x501155 in sixel_helper_load_image_file /root/option/libsixel/src/loader.c:1462:18
    #10 0x4d6c47 in sixel_encoder_encode /root/option/libsixel/src/encoder.c:1816:14
    #11 0x4cd728 in main /root/option/libsixel/converters/img2sixel.c:455:22
    #12 0x732bcc2a9082 in __libc_start_main (/lib/x86_64-linux-gnu/libc.so.6+0x24082)

SUMMARY: AddressSanitizer: 4500 byte(s) leaked in 1 allocation(s).

[optionGo]

The PoC file is

id:000020,sig:08,src:001272+000019,argv:000000,time:2121469,execs:890921,op:splice,rep:2.zip

[saitoha]

@optionGo Thanks for the report. I’ve applied the fix to the develop branch; it will be merged into master at the next release. Also, would you consent to us adding the PoC file you provided to the repository for regression testing?

[optionGo]

Of course! Feel free to add the PoC file to the repository for regression testing. Thank you!