From: Jiasheng Jiang jiasheng@iscas.ac.cn
[ 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 --- fs/pstore/ram_core.c | 2 ++ 1 file changed, 2 insertions(+)
diff --git a/fs/pstore/ram_core.c b/fs/pstore/ram_core.c index 966191d3a5ba2..85aaf0fc6d7d1 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)