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| author | Florian Weimer <fweimer@redhat.com> | 2017-02-27 19:05:13 +0100 |
|---|---|---|
| committer | Florian Weimer <fweimer@redhat.com> | 2017-02-27 19:05:13 +0100 |
| commit | d42eed4a044e5e10dfb885cf9891c2518a72a491 (patch) | |
| tree | 29deb103217e1b09902f05cf49029a93cb76ad1a /sunrpc/clnt_udp.c | |
| parent | 963394a22b38c4ec92b6875a6c06d3b15d5c0d21 (diff) | |
| download | glibc-d42eed4a044e5e10dfb885cf9891c2518a72a491.tar.gz glibc-d42eed4a044e5e10dfb885cf9891c2518a72a491.tar.xz glibc-d42eed4a044e5e10dfb885cf9891c2518a72a491.zip | |
sunrpc: Avoid use-after-free read access in clntudp_call [BZ #21115]
After commit bc779a1a5b3035133024b21e2f339fe4219fb11c (CVE-2016-4429: sunrpc: Do not use alloca in clntudp_call [BZ #20112]), ancillary data is stored on the heap, but it is accessed after it has been freed. The test case must be run under a heap debugger such as valgrind to observe the invalid access. A malloc implementation which immediately calls munmap on free would catch this bug as well.
Diffstat (limited to 'sunrpc/clnt_udp.c')
| -rw-r--r-- | sunrpc/clnt_udp.c | 2 |
1 files changed, 1 insertions, 1 deletions
diff --git a/sunrpc/clnt_udp.c b/sunrpc/clnt_udp.c index 4d9acb1e6a..1de25cb771 100644 --- a/sunrpc/clnt_udp.c +++ b/sunrpc/clnt_udp.c @@ -421,9 +421,9 @@ send_again: cmsg = CMSG_NXTHDR (&msg, cmsg)) if (cmsg->cmsg_level == SOL_IP && cmsg->cmsg_type == IP_RECVERR) { - free (cbuf); e = (struct sock_extended_err *) CMSG_DATA(cmsg); cu->cu_error.re_errno = e->ee_errno; + free (cbuf); return (cu->cu_error.re_status = RPC_CANTRECV); } free (cbuf); |