Subject: bug#25003: Bug in SPLIT utility

From: Jim Meyering <[email-masked]>
Date: Wed, 23 Nov 2016 09:30:59 -0800

On Wed, Nov 23, 2016 at 5:22 AM, Marcel Böhme <[email-masked]> wrote:
> Dear all,
>
> We are running small 1h fuzzing sessions with AFLFast, a fork of AFL.
> We’ll be reporting each found bug separately.
>
> On Coreutils v8.25 and trunk, the following input crashes.
> Option -n was introduced with v8.8.
>
> $ ./split -n7/75 7
> Segmentation fault
>
> ASAN says:
> =================================================================
> ==53143==ERROR: AddressSanitizer: negative-size-param: (size=-6)
>     #0 0x7f8820eb9a10 in memmove (/usr/lib/x86_64-linux-gnu/libasan.so.3+0x62a10)
>     #1 0x404d12 in memmove /usr/include/x86_64-linux-gnu/bits/string3.h:57
>     #2 0x404d12 in bytes_chunk_extract ../src/split.c:987
>     #3 0x404d12 in main ../src/split.c:1625
>     #4 0x7f881fd9cf44 in __libc_start_main (/lib/x86_64-linux-gnu/libc.so.6+0x21f44)
>     #5 0x4064a9  (/home/ubuntu/subjects/coreutils/obj-asan/src/split+0x4064a9)
>
> 0x7f8821f9a006 is located 2054 bytes inside of 135168-byte region [0x7f8821f99800,0x7f8821fba800)
> allocated by thread T0 here:
>     #0 0x7f8820f193a8 in __interceptor_malloc (/usr/lib/x86_64-linux-gnu/libasan.so.3+0xc23a8)
>     #1 0x40ec88 in xmalloc ../lib/xmalloc.c:41
>
> SUMMARY: AddressSanitizer: negative-size-param (/usr/lib/x86_64-linux-gnu/libasan.so.3+0x62a10) in memmove

Thank you for the report.
Would you please provide the contents of your file named "7"?