[BUILTIN] Fixed command -v segmentation fault

On Sat, Oct 21, 2006 at 02:19:18PM +0000, Gerrit Pape wrote:
> Hi Herbert, please see
>  http://bugs.debian.org/cgi-bin/bugreport.cgi?bug=387458
>
> On Thu, Sep 14, 2006 at 03:50:02PM +0200, Julien Danjou wrote:
> > I just found this bug which is easily reproductible:
> >
> > % dash -c 'command -v'
> > zsh: segmentation fault  dash -c 'command -v'

Since bash's behaviour is minimalist here, I've decided to adopt its
behaviour here as well which is to return success silently.

1 files changed, 4 insertions, 2 deletions

diff --git a/src/exec.c b/src/exec.c
index 417ba8a..c55683d 100644
--- a/src/exec.c
+++ b/src/exec.c
@@ -846,6 +846,7 @@ commandcmd(argc, argv)
 	int argc;
 	char **argv;
 {
+	char *cmd;
 	int c;
 	enum {
 		VERIFY_BRIEF = 1,
@@ -862,8 +863,9 @@ commandcmd(argc, argv)
 			abort();
 #endif
 
-	if (verify)
-		return describe_command(out1, *argptr, verify - VERIFY_BRIEF);
+	cmd = *argptr;
+	if (verify && cmd)
+		return describe_command(out1, cmd, verify - VERIFY_BRIEF);
 
 	return 0;
 }