Unziping a specially crafted zip file results in a computation of an invalid pointer and an invalid read. Find a attached a test case to reproduce it. A complete backtrace in busybox 1.21 (debug) is available here:

$ gdb --args ./busybox_unstripped unzip x.-6170921383890712452 
...
(gdb) run
Starting program: /home/g/Code/busybox-1.21.0/busybox_unstripped unzip x.-6170921383890712452
[Thread debugging using libthread_db enabled]
Using host libthread_db library "/lib/x86_64-linux-gnu/libthread_db.so.1".
Archive:  x.-6170921383890712452
  inflating: ]3j½r«IK-%Ix

Program received signal SIGSEGV, Segmentation fault.
huft_build (b=b@entry=0x7fffffffd320, n=n@entry=264, s=s@entry=257, d=d@entry=0x5fa900 <cplens>, e=e@entry=0x5fa8c0 <cplext> "", t=0x60620000eb08, 
    t@entry=0x602c0000fe60, m=0x7fffffffd260) at archival/libarchive/decompress_gunzip.c:441
441					r.e = (unsigned char) e[*p - s]; /* non-simple--look up in lists */
(gdb) bt
#0  huft_build (b=b@entry=0x7fffffffd320, n=n@entry=264, s=s@entry=257, d=d@entry=0x5fa900 <cplens>, e=e@entry=0x5fa8c0 <cplext> "", 
    t=0x60620000eb08, t@entry=0x602c0000fe60, m=0x7fffffffd260) at archival/libarchive/decompress_gunzip.c:441
#1  0x0000000000520b52 in inflate_block (state=state@entry=0x602c0000fe00, e=e@entry=0x602c0000fe83 "") at archival/libarchive/decompress_gunzip.c:905
#2  0x00000000005222d1 in inflate_get_next_window (state=0x602c0000fe00) at archival/libarchive/decompress_gunzip.c:947
#3  inflate_unzip_internal (state=state@entry=0x602c0000fe00, in=in@entry=3, out=out@entry=4) at archival/libarchive/decompress_gunzip.c:1004
#4  0x0000000000522a6a in inflate_unzip (aux=aux@entry=0x7fffffffdc30, in=in@entry=3, out=out@entry=4) at archival/libarchive/decompress_gunzip.c:1048
#5  0x000000000051b255 in unzip_extract (dst_fd=4, zip_header=0x7fffffffdd50) at archival/unzip.c:255
#6  unzip_main (argc=<optimized out>, argv=<optimized out>) at archival/unzip.c:654
#7  0x00000000004088bd in run_applet_no_and_exit (applet_no=applet_no@entry=328, argv=argv@entry=0x7fffffffe170) at libbb/appletlib.c:759
#8  0x0000000000408935 in run_applet_and_exit (name=0x7fffffffe4c8 "unzip", argv=argv@entry=0x7fffffffe170) at libbb/appletlib.c:766
#9  0x0000000000408e7c in busybox_main (argv=0x7fffffffe170) at libbb/appletlib.c:728
#10 run_applet_and_exit (name=<optimized out>, argv=argv@entry=0x7fffffffe168) at libbb/appletlib.c:768
#11 0x0000000000408f65 in main (argc=<optimized out>, argv=0x7fffffffe168) at libbb/appletlib.c:823

(gdb) x/i $rip
=> 0x51fb17 <huft_build+2852>:	mov    (%rdi),%dl
(gdb) info registers 
rax            0x0	0
rbx            0x57	87
rcx            0x814a18	8473112
rdx            0x140900	1313024
rsi            0x5fa900	6269184
rdi            0xa04dcc	10505676
rbp            0x10007fff7940	0x10007fff7940
rsp            0x7fffffffc930	0x7fffffffc930
r8             0x7fffffffcb64	140737488341860
r9             0x7fffffffcbe8	140737488341992
r10            0x60620000eb10	105974023121680
r11            0x7fffffffcadc	140737488341724
r12            0x7fffffffd260	140737488343648
r13            0x8	8
r14            0x10007fff7944	17594333493572
r15            0x0	0
rip            0x51fb17	0x51fb17 <huft_build+2852>
eflags         0x10216	[ PF AF IF RF ]
cs             0x33	51
ss             0x2b	43
ds             0x0	0
es             0x0	0
fs             0x0	0
gs             0x0	0

This issue was discovered with QuickFuzz

Thanks!