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monitor: Fix file_completion() to check for stat() failure

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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>
This commit is contained in:
Markus Armbruster 2011-11-16 15:43:47 +01:00 committed by Stefan Hajnoczi
parent e6d89f8c25
commit c951d9a675
1 changed files with 2 additions and 2 deletions
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4
monitor.c
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@ -4207,9 +4207,9 @@ static void file_completion(const char *input)
/* 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);
}
}