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authorMateusz Jurczyk <mjurczyk@google.com>2017-06-13 18:44:28 +0200
committerSamuel Ortiz <sameo@linux.intel.com>2017-06-23 00:38:31 +0200
commitf6a5885fc4d68e7f25ffb42b9d8d80aebb3bacbb (patch)
tree829ed516b1f0f3eb98c27cebeaca12eaa11664f6 /net/nfc
parent6f874bafacf053b87887f4149fc117e2b1096138 (diff)
downloadlinux-f6a5885fc4d68e7f25ffb42b9d8d80aebb3bacbb.tar.bz2
NFC: Add sockaddr length checks before accessing sa_family in bind handlers
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>
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 d0d12bea65cb..fb7afcaa3004 100644
--- a/net/nfc/llcp_sock.c
+++ b/net/nfc/llcp_sock.c
@@ -77,7 +77,8 @@ 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);
@@ -151,7 +152,8 @@ 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);