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core: add extra checks in function eval_string_range_chars

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This is done in addition to changes made in commit
d475c16671 to fix the buffer overflow, caused by
the call to function utf8_next_char.
This commit is contained in:
Sébastien Helleu
2025-05-11 10:26:17 +02:00
parent 1efa9d6b08
commit 7b674c2618
1 changed files with 7 additions and 0 deletions
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src/core/core-eval.c
+7
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@@ -302,6 +302,9 @@ eval_string_range_chars (const char *range)
string = NULL;
result = NULL;
if (!range || !range[0])
goto end;
for (i = 0; eval_range_chars[i][0]; i++)
{
if (strcmp (range, eval_range_chars[i][0]) == 0)
@@ -311,11 +314,15 @@ eval_string_range_chars (const char *range)
char1 = utf8_char_int (range);
/* next char must be '-' */
if (!range[0])
goto end;
ptr_char = utf8_next_char (range);
if (!ptr_char || !ptr_char[0] || (ptr_char[0] != '-'))
goto end;
/* next char is the char2 */
if (!range[0])
goto end;
ptr_char = utf8_next_char (ptr_char);
if (!ptr_char || !ptr_char[0])
goto end;