1 files changed, 15 insertions, 0 deletions

diff --git a/fs/exec.c b/fs/exec.c
index d8e1191cb112..237d5342786c 100644
--- a/fs/exec.c
+++ b/fs/exec.c
@@ -1175,9 +1175,24 @@ void free_bprm(struct linux_binprm *bprm)
                 mutex_unlock(&current->signal->cred_guard_mutex);
                 abort_creds(bprm->cred);
         }
+        /* If a binfmt changed the interp, free it. */
+        if (bprm->interp != bprm->filename)
+                kfree(bprm->interp);
         kfree(bprm);
 }
 
+int bprm_change_interp(char *interp, struct linux_binprm *bprm)
+{
+        /* If a binfmt changed the interp, free it first. */
+        if (bprm->interp != bprm->filename)
+                kfree(bprm->interp);
+        bprm->interp = kstrdup(interp, GFP_KERNEL);
+        if (!bprm->interp)
+                return -ENOMEM;
+        return 0;
+}
+EXPORT_SYMBOL(bprm_change_interp);
+
 /*
  * install the new credentials for this executable
  */