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bug#24118: 25.1; [PATCH] Fix a possible crash caused by mapcar1
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From: |
Andreas Schwab |
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Subject: |
bug#24118: 25.1; [PATCH] Fix a possible crash caused by mapcar1 |
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Date: |
Sun, 31 Jul 2016 15:18:09 +0200 |
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User-agent: |
Gnus/5.13 (Gnus v5.13) Emacs/25.1 (gnu/linux) |
Chris Feng <chris.w.feng@gmail.com> writes:
> diff --git a/src/fns.c b/src/fns.c
> index d5a1f74..1804bce 100644
> --- a/src/fns.c
> +++ b/src/fns.c
> @@ -2524,6 +2524,10 @@ mapcar1 (EMACS_INT leni, Lisp_Object *vals,
> Lisp_Object fn, Lisp_Object seq)
> vals[i] = dummy;
> tail = XCDR (tail);
> }
> +
> + /* In case the list was tampered and the loop terminated early. */
> + if (i < leni)
> + memclear (vals + i, (leni - i) * word_size);
That should not depend on the representation of Qnil.
Andreas.
--
Andreas Schwab, schwab@linux-m68k.org
GPG Key fingerprint = 58CA 54C7 6D53 942B 1756 01D3 44D5 214B 8276 4ED5
"And now for something completely different."