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 <navid.emamdoost@gmail.com>
Fixes: 1227daa43bce ("pstore/ram: Clarify resource reservation labels")
Cc: stable@vger.kernel.org
Link: https://lore.kernel.org/lkml/20191211191353.14385-1-navid.emamdoost@gmail.com
Signed-off-by: Kees Cook <keescook@chromium.org>

diff --git a/fs/pstore/ram.c b/fs/pstore/ram.c
index 8caff834f002668eb79d84d2adf8c108dbc2c640..f753f3b6f88dde03ed6f32f2a7d737cf90570afd 100644 (file)
--- a/fs/pstore/ram.c
+++ b/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;
        }