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hush: fix 'x=; echo ${x:-"$@"}' producing 'BUG in varexp2' message

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function                                             old     new   delta
expand_string_to_string                              126     128      +2

Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
This commit is contained in:
Denys Vlasenko 2018-07-18 16:02:25 +02:00
parent 8b08d5a502
commit 2e71101e31
1 changed files with 14 additions and 7 deletions
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21
shell/hush.c
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@ -6529,13 +6529,20 @@ static char *expand_string_to_string(const char *str, int EXP_flags, int do_unba
argv[0] = (char*)str;
argv[1] = NULL;
list = expand_variables(argv, EXP_flags | EXP_FLAG_SINGLEWORD);
if (HUSH_DEBUG)
if (!list[0] || list[1])
bb_error_msg_and_die("BUG in varexp2");
/* actually, just move string 2*sizeof(char*) bytes back */
overlapping_strcpy((char*)list, list[0]);
if (do_unbackslash)
unbackslash((char*)list);
if (!list[0]) {
/* Example where it happens:
* x=; echo ${x:-"$@"}
*/
((char*)list)[0] = '\0';
} else {
if (HUSH_DEBUG)
if (list[1])
bb_error_msg_and_die("BUG in varexp2");
/* actually, just move string 2*sizeof(char*) bytes back */
overlapping_strcpy((char*)list, list[0]);
if (do_unbackslash)
unbackslash((char*)list);
}
debug_printf_expand("string_to_string=>'%s'\n", (char*)list);
return (char*)list;
}