pstore/ram: Add check for kstrdup
Add check for the return value of kstrdup() and return the error
if it fails in order to avoid NULL pointer dereference.
Fixes: e163fdb3f7f8 ("pstore/ram: Regularize prz label allocation lifetime")
Signed-off-by: Jiasheng Jiang <jiasheng@iscas.ac.cn>
Signed-off-by: Kees Cook <keescook@chromium.org>
Link: https://lore.kernel.org/r/20230614093733.36048-1-jiasheng@iscas.ac.cn
diff --git a/fs/pstore/ram_core.c b/fs/pstore/ram_core.c
index 966191d..85aaf0fc 100644
--- a/fs/pstore/ram_core.c
+++ b/fs/pstore/ram_core.c
@@ -599,6 +599,8 @@ struct persistent_ram_zone *persistent_ram_new(phys_addr_t start, size_t size,
raw_spin_lock_init(&prz->buffer_lock);
prz->flags = flags;
prz->label = kstrdup(label, GFP_KERNEL);
+ if (!prz->label)
+ goto err;
ret = persistent_ram_buffer_map(start, size, prz, memtype);
if (ret)
