monitor: Fix file_completion() to check for stat() failure
stat() can fail for a file name just read with readdir(). Easiest way
to trigger is a dangling symbolic link --- look ma, no race! When it
fails, file_completion() uses sb.st_mode uninitialized. If the
directory bit happens to be set, it appends a "/" to the completed
name.
Signed-off-by: Markus Armbruster <armbru@redhat.com>
Signed-off-by: Stefan Hajnoczi <stefanha@linux.vnet.ibm.com>
diff --git a/monitor.c b/monitor.c
index 5ea35de..1be222e 100644
--- a/monitor.c
+++ b/monitor.c
@@ -4207,9 +4207,9 @@
/* stat the file to find out if it's a directory.
* In that case add a slash to speed up typing long paths
*/
- stat(file, &sb);
- if(S_ISDIR(sb.st_mode))
+ if (stat(file, &sb) == 0 && S_ISDIR(sb.st_mode)) {
pstrcat(file, sizeof(file), "/");
+ }
readline_add_completion(cur_mon->rs, file);
}
}
