Dominique Pellé wrote:
> Here is another bug discovered by afl-fuzz which is
> ruthless at finding bugs. The following command
> crashes vim-7.4.823 (and older):
>
> $ vim -u NONE -c ow -c 'sy keyword x c'
> Vim: Caught deadly signal SEGV
> Vim: Finished.
> Segmentation fault (core dumped)
>
> $ cgdb --args ./vim -u NONE -c ow -c 'sy keyword x c'
>
> 153│ idx = (unsigned)(hash & ht->ht_mask);
> 154│ hi = &ht->ht_array[idx];
> 155│
> 156├> if (hi->hi_key == NULL)
> 157│ return hi;
>
> (gdb) p hi
> $1 = (hashitem_T *) 0x0
>
> (gdb) p idx
> $2 = 0
>
> (gdb) p hash
> $3 = 99
>
> (gdb) p ht->ht_mask
> $4 = 0
>
> (gdb) bt
> #0 0x00000000004e2b5d in hash_lookup (ht=0x965a00, key=0x965f48 "c",
> hash=99) at hashtab.c:156
> #1 0x000000000061ca44 in add_keyword (name=0x965f00 "c", id=46,
> flags=0, cont_in_list=0x0, next_list=0x0, conceal_char=0) at
> syntax.c:4458
> #2 0x00000000006174f5 in syn_cmd_keyword (eap=0x7fffffffd428,
> syncing=0) at syntax.c:4868
> #3 0x000000000060f0b5 in ex_syntax (eap=0x7fffffffd428) at syntax.c:6296
> #4 0x000000000049053b in do_one_cmd (cmdlinep=0x7fffffffdb88,
> sourcing=1, cstack=0x7fffffffd6d0, fgetline=0x0, cookie=0x0) at
> ex_docmd.c:2941
> #5 0x000000000048bdfe in do_cmdline (cmdline=0x7fffffffe2a0 "sy
> keyword x c", fgetline=0x0, cookie=0x0, flags=11) at ex_docmd.c:1133
> #6 0x000000000048cca6 in do_cmdline_cmd (cmd=0x7fffffffe2a0 "sy
> keyword x c") at ex_docmd.c:738
> #7 0x00000000006777e8 in exe_commands (parmp=0x7fffffffdc78) at main.c:2926
> #8 0x00000000006742fd in main (argc=7, argv=0x7fffffffdeb8) at main.c:961
>
> Valgrind or asan don't give more info.
> Sorry no patch. I'm not sure how to fix it.
Thanks for the report. Perhaps someone else knows how to fix it.
--
With sufficient thrust, pigs fly just fine.
-- RFC 1925
/// Bram Moolenaar -- [email protected] -- http://www.Moolenaar.net \\\
/// sponsor Vim, vote for features -- http://www.Vim.org/sponsor/ \\\
\\\ an exciting new programming language -- http://www.Zimbu.org ///
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