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patch 9.0.1995: Invalid memory access with empty 'foldexpr'

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Problem:  Invalid memory access when 'foldexpr' returns empty string.
Solution: Check for NUL.

closes: #13293

Signed-off-by: Christian Brabandt <cb@256bit.org>
Co-authored-by: zeertzjq <zeertzjq@outlook.com>
This commit is contained in:
zeertzjq
2023-10-06 19:16:36 +02:00
committed by Christian Brabandt
parent ac9c6d5c78
commit a991ce9c08
3 changed files with 12 additions and 1 deletions
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2
src/eval.c
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@@ -968,7 +968,7 @@ eval_foldexpr(win_T *wp, int *cp)
// If the result is a string, check if there is a non-digit before
// the number.
s = tv.vval.v_string;
if (!VIM_ISDIGIT(*s) && *s != '-')
if (*s != NUL && !VIM_ISDIGIT(*s) && *s != '-')
*cp = *s++;
retval = atol((char *)s);
}