pstore/ram: Add check for kstrdup

[ Upstream commit d97038d5ec2062733c1e016caf9baaf68cf64ea1 ]

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
Signed-off-by: Sasha Levin <sashal@kernel.org>

diff --git a/fs/pstore/ram_core.c b/fs/pstore/ram_core.c
index 8bf0988..2384de1 100644 (file)
--- a/fs/pstore/ram_core.c
+++ b/fs/pstore/ram_core.c
@@ -591,6 +591,8 @@ 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)