ramoops: Only unregister when registered

While none of the "fragile" pstore backends unregister yet, if they
ever did, the unregistering code for the non-dump targets might get
confused. This adds a check for fragile backends on unregister.

Signed-off-by: Kees Cook <keescook@chromium.org>

diff --git a/fs/pstore/platform.c b/fs/pstore/platform.c
index 588461bb2dd482bc7906cb284c57b1e6ff92de87..e8c17afdfb41d3ca5b775502832c3eece51df3fb 100644 (file)
--- a/fs/pstore/platform.c
+++ b/fs/pstore/platform.c
@@ -497,9 +497,11 @@ EXPORT_SYMBOL_GPL(pstore_register);
 
 void pstore_unregister(struct pstore_info *psi)
 {
-       pstore_unregister_pmsg();
-       pstore_unregister_ftrace();
-       pstore_unregister_console();
+       if ((psi->flags & PSTORE_FLAGS_FRAGILE) == 0) {
+               pstore_unregister_pmsg();
+               pstore_unregister_ftrace();
+               pstore_unregister_console();
+       }
        pstore_unregister_kmsg();
 
        free_buf_for_compression();