sbase

commit 453ce96d44b8bf9de7cccb68dba9d5233d630ea2
parent 73115682ede243bdbe5f69779e9fec0dc1698a80
Author: Michael Forney <mforney@mforney.org>
Date:   Sat,  1 Nov 2014 20:36:37 +0000

tar: Don't crash when get{pw,gr}uid fails

Diffstat:
M
tar.c
 | 
4
++--

1 file changed, 2 insertions(+), 2 deletions(-)
diff --git a/tar.c b/tar.c
@@ -177,8 +177,8 @@ archive(const char* path)
 	putoctal(h->mtime, (unsigned)st.st_mtime,     sizeof h->mtime);
 	memcpy(h->magic,   "ustar",                   sizeof h->magic);
 	memcpy(h->version, "00",                      sizeof h->version);
-	snprintf(h->uname, sizeof h->uname, "%s", pw->pw_name);
-	snprintf(h->gname, sizeof h->gname, "%s", gr->gr_name);
+	snprintf(h->uname, sizeof h->uname, "%s", pw ? pw->pw_name : "");
+	snprintf(h->gname, sizeof h->gname, "%s", gr ? gr->gr_name : "");
 
 	mode = st.st_mode;
 	if(S_ISREG(mode)) {