Fix extract_archive so it doesnt mangle filenames, dont try and extract "./" and strip leading "./" on other files

1 files changed, 6 insertions, 3 deletions

diff --git a/libbb/unarchive.c b/libbb/unarchive.c
index adc5d8d6e..ca654a6ca 100644
--- a/libbb/unarchive.c
+++ b/libbb/unarchive.c
@@ -82,8 +82,11 @@ char *extract_archive(FILE *src_stream, FILE *out_stream, const file_header_t *f
                 /* strip leading '/' in filename to extract as prefix may not be dir */
                 /* Cant use concat_path_file here as prefix might not be a directory */
                 char *path = file_entry->name;
-                if (*path == '/') {
-                        path++;
+                if (strncmp("./", path, 2) == 0) {
+                        path += 2;
+                        if (strlen(path) == 0) {
+                                return(NULL);
+                        }
                 }
                 full_name = xmalloc(strlen(prefix) + strlen(path) + 1);
                 strcpy(full_name, prefix);
@@ -91,7 +94,6 @@ char *extract_archive(FILE *src_stream, FILE *out_stream, const file_header_t *f
         } else {
                 full_name = file_entry->name;
         }
-
         if (function & extract_to_stdout) {
                 if (S_ISREG(file_entry->mode)) {
                         copy_file_chunk(src_stream, out_stream, file_entry->size);                      
@@ -244,6 +246,7 @@ char *unarchive(FILE *src_stream, FILE *out_stream, file_header_t *(*get_headers
                                 }
                         }
                 }
+
                 if (found) {
                         buffer = extract_archive(src_stream, out_stream, file_entry, extract_function, prefix);
                 } else {