pstore/ram: Fix error-path memory leak in persistent_ram_new() callers

For callers that allocated a label for persistent_ram_new(), if the call
fails, they must clean up the allocation.

Suggested-by: Navid Emamdoost <[email protected]>
Fixes: 1227daa43b ("pstore/ram: Clarify resource reservation labels")
Cc: [email protected]
Link: https://lore.kernel.org/lkml/[email protected]
Signed-off-by: Kees Cook <[email protected]>

fs/pstore/ram.c

@@ -577,6 +577,7 @@ static int ramoops_init_przs(const char *name,
 			dev_err(dev, "failed to request %s mem region (0x%zx@0x%llx): %d\n",
 				name, record_size,
 				(unsigned long long)*paddr, err);
+			kfree(label);
 
 			while (i > 0) {
 				i--;
@@ -622,6 +623,7 @@ static int ramoops_init_prz(const char *name,
 
 		dev_err(dev, "failed to request %s mem region (0x%zx@0x%llx): %d\n",
 			name, sz, (unsigned long long)*paddr, err);
+		kfree(label);
 		return err;
 	}