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Subject[PATCH 4.9 032/138] libceph: dont WARN() if user tries to add invalid key
Date
4.9-stable review patch.  If anyone has any objections, please let me know.

------------------

From: Eric Biggers <ebiggers@google.com>

commit b11270853fa3654f08d4a6a03b23ddb220512d8d upstream.

The WARN_ON(!key->len) in set_secret() in net/ceph/crypto.c is hit if a
user tries to add a key of type "ceph" with an invalid payload as
follows (assuming CONFIG_CEPH_LIB=y):

echo -e -n '\x01\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00' \
| keyctl padd ceph desc @s

This can be hit by fuzzers. As this is merely bad input and not a
kernel bug, replace the WARN_ON() with return -EINVAL.

Fixes: 7af3ea189a9a ("libceph: stop allocating a new cipher on every crypto request")
Signed-off-by: Eric Biggers <ebiggers@google.com>
Reviewed-by: Ilya Dryomov <idryomov@gmail.com>
Signed-off-by: Ilya Dryomov <idryomov@gmail.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

---
net/ceph/crypto.c | 4 +++-
1 file changed, 3 insertions(+), 1 deletion(-)

--- a/net/ceph/crypto.c
+++ b/net/ceph/crypto.c
@@ -34,7 +34,9 @@ static int set_secret(struct ceph_crypto
return -ENOTSUPP;
}

- WARN_ON(!key->len);
+ if (!key->len)
+ return -EINVAL;
+
key->key = kmemdup(buf, key->len, GFP_NOIO);
if (!key->key) {
ret = -ENOMEM;

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