Exceeding the valid memory range while parsing the GIF file's background

[tank0123]

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2021-05-17-08_03_20_0x4c61b6c1_0xb1c1261c.zip

==49150==ERROR: LeakSanitizer: SEGV on unknown address 0x7ffff6320000 (pc 0x55555555b07e bp 0x7fffffff5820 sp 0x7fffffff57c0 T0)
==49150==The signal is caused by a WRITE memory access.
#0 0x55555555b07e in memcpy /usr/include/x86_64-linux-gnu/bits/string_fortified.h:34
#1 0x55555555b07e in stbi__gif_load_next /home/ubuntu/tmp/catimg-2.7.0/src/stb_image.h:6581
#2 0x55555555b262 in stbi__xload_main /home/ubuntu/tmp/catimg-2.7.0/src/sh_image.c:29
#3 0x555555562cf4 in stbi__xload_main /home/ubuntu/tmp/catimg-2.7.0/src/sh_image.c:17
#4 0x555555562dc0 in stbi_xload /home/ubuntu/tmp/catimg-2.7.0/src/sh_image.c:106
#5 0x55555556309c in img_load_from_file /home/ubuntu/tmp/catimg-2.7.0/src/sh_image.c:202
#6 0x5555555565db in main /home/ubuntu/tmp/catimg-2.7.0/src/catimg.c:146
#7 0x7ffff73a30b2 in __libc_start_main (/lib/x86_64-linux-gnu/libc.so.6+0x270b2)
#8 0x5555555569bd in _start (/home/ubuntu/tmp/catimg-2.7.0/bin/catimg+0x29bd)

LeakSanitizer can not provide additional info.
SUMMARY: LeakSanitizer: SEGV /usr/include/x86_64-linux-gnu/bits/string_fortified.h:34 in memcpy