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authorEric Biggers <ebiggers@google.com>2017-12-08 15:13:29 +0000
committerDavid Howells <dhowells@redhat.com>2017-12-08 15:13:29 +0000
commit18026d866801d0c52e5550210563222bd6c7191d (patch)
tree744c23841e67ff704fa4374b14a05ec542b4f4eb /crypto/asymmetric_keys
parent3d1f0255426af7eeb88bf7221ff683b7ca9e4493 (diff)
downloadlinux-18026d866801d0c52e5550210563222bd6c7191d.tar.bz2
KEYS: reject NULL restriction string when type is specified
keyctl_restrict_keyring() allows through a NULL restriction when the "type" is non-NULL, which causes a NULL pointer dereference in asymmetric_lookup_restriction() when it calls strcmp() on the restriction string. But no key types actually use a "NULL restriction" to mean anything, so update keyctl_restrict_keyring() to reject it with EINVAL. Reported-by: syzbot <syzkaller@googlegroups.com> Fixes: 97d3aa0f3134 ("KEYS: Add a lookup_restriction function for the asymmetric key type") Cc: <stable@vger.kernel.org> # v4.12+ Signed-off-by: Eric Biggers <ebiggers@google.com> Signed-off-by: David Howells <dhowells@redhat.com>
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