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Re: Segmentation fault in pat_subst

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  Re: Segmentation fault in pat_subst Eduardo A. Bustamante López <dualbus@gmail.com> - 2019-07-23 22:32 -0700

#15222 — Re: Segmentation fault in pat_subst

On Sun, Jul 21, 2019 at 06:56:09PM -0400, Chet Ramey wrote:
(...)
> Thanks for the report. Look at match_wpattern and consider what happens if
> wmatchlen returns something longer than the string length. It will be fixed
> for the next devel branch push.

Aha! I see.

| Starting program: /tmp/bash/bash -c x=0\;\ :\ \$\{x/\#\[0�\\Z\[:\]\]\}
| 
| Breakpoint 1, match_wpattern (wstring=0x5555556c1d90 L"0", indices=0x5555556c1e20, wstrlen=1, wpat=0x5555556c1d00 L"[0�\\Z[:]]", mtype=1, sp=0x7fffffffd918, ep=0x7fffffffd910)
|     at /home/dualbus/src/gnu/bash/subst.c:4963
| 4963      if (mlen > wstrlen)
| (gdb) p mlen
| $1 = 2
| (gdb) p wstrlen
| $2 = 1

Interesting, I can see how that `mlen = 2' can cause trouble. Thank you for the pointer and the fix!

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