When lstat returns an error (such as file not found), the value of

st_mode is random garbage (under uClibc), leading to random triggering
of the S_ISDIR() case when the destination will be a normal file which
doesn't exist yet.  I.E. checking the return value of lstat is not optional.

1 files changed, 9 insertions, 10 deletions

diff --git a/coreutils/install.c b/coreutils/install.c
index d0460412e..9fcb75405 100644
--- a/coreutils/install.c
+++ b/coreutils/install.c
@@ -51,7 +51,6 @@ static const struct option install_long_options[] = {
 
 extern int install_main(int argc, char **argv)
 {
-        struct stat statbuf;
         mode_t mode;
         uid_t uid;
         gid_t gid;
@@ -59,9 +58,7 @@ extern int install_main(int argc, char **argv)
         char *uid_str = "-1";
         char *mode_str = "0755";
         int copy_flags = FILEUTILS_DEREFERENCE | FILEUTILS_FORCE;
-        int ret = EXIT_SUCCESS;
-        int flags;
-        int i;
+        int ret = EXIT_SUCCESS, flags, i, isdir;
 
         bb_applet_long_options = install_long_options;
         bb_opt_complementally = "!s~d:d~s";
@@ -112,15 +109,16 @@ extern int install_main(int argc, char **argv)
                 return(ret);
         }
 
-        cp_mv_stat2(argv[argc - 1], &statbuf, lstat);
+        {
+                struct stat statbuf;
+                isdir = lstat(argv[argc - 1], &statbuf)<0
+                                        ? 0 : S_ISDIR(statbuf.st_mode);
+        }
         for (i = optind; i < argc - 1; i++) {
                 unsigned char *dest;
 
-                if (S_ISDIR(statbuf.st_mode)) {
-                        dest = concat_path_file(argv[argc - 1], basename(argv[i]));
-                } else {
-                        dest = argv[argc - 1];
-                }
+                dest = argv[argc - 1];
+                if (isdir) dest = concat_path_file(argv[argc - 1], basename(argv[i]));
                 ret |= copy_file(argv[i], dest, copy_flags);
 
                 /* Set the file mode */
@@ -140,6 +138,7 @@ extern int install_main(int argc, char **argv)
                                 ret = EXIT_FAILURE;
                         }
                 }
+                if(ENABLE_FEATURE_CLEAN_UP && isdir) free(dest);
         }
 
         return(ret);