Segmentation Fault in ngiflib.c

[c0d3xpl0it]

We found Segmentation Fault issue in gif2tga binary and gif2tga is complied with clang enabling ASAN.

Machine Setup
Machine : Ubuntu 16.04.3 LTS
gcc version 5.4.0 20160609 (Ubuntu 5.4.0-6ubuntu1~16.04.11)
Commit : 992d272
Command : ./gif2tga $POC

POC :- GifIndexToTrueColor-SEGV.zip

ASAN Output

fuzzer@thickfuzzer:~/fuzzer/ngiflib$ ./gif2tga in/GifIndexToTrueColor-SEGV
ASAN:DEADLYSIGNAL
=================================================================
==11610==ERROR: AddressSanitizer: SEGV on unknown address 0x000000000005 (pc 0x0000004f2268 bp 0x7ffe389c63f0 sp 0x7ffe389c1d20 T0)
    #0 0x4f2267 in GifIndexToTrueColor /home/fuzzer/fuzzer/ngiflib/ngiflib.c:844:20
    #1 0x4f2267 in WritePixel /home/fuzzer/fuzzer/ngiflib/ngiflib.c:134
    #2 0x4f2267 in DecodeGifImg /home/fuzzer/fuzzer/ngiflib/ngiflib.c:560
    #3 0x4f2267 in LoadGif /home/fuzzer/fuzzer/ngiflib/ngiflib.c:825
    #4 0x4ea8a6 in main /home/fuzzer/fuzzer/ngiflib/gif2tga.c:95:10
    #5 0x7f2b1146c82f in __libc_start_main /build/glibc-LK5gWL/glibc-2.23/csu/../csu/libc-start.c:291
    #6 0x418a98 in _start (/home/fuzzer/fuzzer/ngiflib/gif2tga+0x418a98)

AddressSanitizer can not provide additional info.
SUMMARY: AddressSanitizer: SEGV /home/fuzzer/fuzzer/ngiflib/ngiflib.c:844:20 in GifIndexToTrueColor
==11610==ABORTING
fuzzer@thickfuzzer:~/fuzzer/ngiflib$