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authorMateusz Jurczyk <mjurczyk@google.com>2017-06-13 18:44:28 +0200
committerGreg Kroah-Hartman <gregkh@linuxfoundation.org>2017-07-27 15:07:56 -0700
commit244a7db0e9d584af63e1cfe4911d3200d1b180ee (patch)
treec04709e42675946d6a2ff1dee2fe88a63b3cef3a /net/nfc
parent4a142251a315e4df6f12a7c99a2a6dfe4ac273ec (diff)
NFC: Add sockaddr length checks before accessing sa_family in bind handlers
commit f6a5885fc4d68e7f25ffb42b9d8d80aebb3bacbb upstream. Verify that the caller-provided sockaddr structure is large enough to contain the sa_family field, before accessing it in bind() handlers of the AF_NFC socket. Since the syscall doesn't enforce a minimum size of the corresponding memory region, very short sockaddrs (zero or one byte long) result in operating on uninitialized memory while referencing .sa_family. Signed-off-by: Mateusz Jurczyk <mjurczyk@google.com> Signed-off-by: Samuel Ortiz <sameo@linux.intel.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'net/nfc')
-rw-r--r--net/nfc/llcp_sock.c6
1 files changed, 4 insertions, 2 deletions
diff --git a/net/nfc/llcp_sock.c b/net/nfc/llcp_sock.c
index 19c2ca1a1548..e31dea17473d 100644
--- a/net/nfc/llcp_sock.c
+++ b/net/nfc/llcp_sock.c
@@ -76,7 +76,8 @@ static int llcp_sock_bind(struct socket *sock, struct sockaddr *addr, int alen)
struct sockaddr_nfc_llcp llcp_addr;
int len, ret = 0;
- if (!addr || addr->sa_family != AF_NFC)
+ if (!addr || alen < offsetofend(struct sockaddr, sa_family) ||
+ addr->sa_family != AF_NFC)
return -EINVAL;
pr_debug("sk %p addr %p family %d\n", sk, addr, addr->sa_family);
@@ -150,7 +151,8 @@ static int llcp_raw_sock_bind(struct socket *sock, struct sockaddr *addr,
struct sockaddr_nfc_llcp llcp_addr;
int len, ret = 0;
- if (!addr || addr->sa_family != AF_NFC)
+ if (!addr || alen < offsetofend(struct sockaddr, sa_family) ||
+ addr->sa_family != AF_NFC)
return -EINVAL;
pr_debug("sk %p addr %p family %d\n", sk, addr, addr->sa_family);