ubifs: add check for crypto_shash_tfm_digest
Add check for the return value of crypto_shash_tfm_digest() and return
the error if it fails in order to catch the error.
Fixes: 817aa094842d ("ubifs: support offline signed images")
Signed-off-by: Chen Ni <nichen@iscas.ac.cn>
Reviewed-by: Zhihao Cheng <chengzhihao1@huawei.com>
Signed-off-by: Richard Weinberger <richard@nod.at>
diff --git a/fs/ubifs/master.c b/fs/ubifs/master.c
index 7adc37c..a148760 100644
--- a/fs/ubifs/master.c
+++ b/fs/ubifs/master.c
@@ -67,10 +67,13 @@
{
u8 calc[UBIFS_MAX_HASH_LEN];
const void *node = mst;
+ int ret;
- crypto_shash_tfm_digest(c->hash_tfm, node + sizeof(struct ubifs_ch),
+ ret = crypto_shash_tfm_digest(c->hash_tfm, node + sizeof(struct ubifs_ch),
UBIFS_MST_NODE_SZ - sizeof(struct ubifs_ch),
calc);
+ if (ret)
+ return ret;
if (ubifs_check_hash(c, expected, calc))
return -EPERM;
