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| author | Denys Vlasenko | 2018-07-18 16:02:25 +0200 |
|---|---|---|
| committer | Denys Vlasenko | 2018-07-18 16:02:25 +0200 |
| commit | 2e71101e31b8b421cee0107c4136d68b65e3a5d8 (patch) | |
| tree | 7133a7b78605cdf71bfde5a8066c4c12918f9184 /shell | |
| parent | 8b08d5a502adec2067e3ebf7f27513f75b0b95e8 (diff) | |
| download | busybox-2e71101e31b8b421cee0107c4136d68b65e3a5d8.zip busybox-2e71101e31b8b421cee0107c4136d68b65e3a5d8.tar.gz | |
hush: fix 'x=; echo ${x:-"$@"}' producing 'BUG in varexp2' message
function old new delta
expand_string_to_string 126 128 +2
Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
Diffstat (limited to 'shell')
| -rw-r--r-- | shell/hush.c | 21 |
1 files changed, 14 insertions, 7 deletions
diff --git a/shell/hush.c b/shell/hush.c index 534fabb..da10a09 100644 --- a/shell/hush.c +++ b/shell/hush.c @@ -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; } |