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| author | Eric Dumazet <edumazet@google.com> | 2021-09-14 08:18:51 +0300 |
|---|---|---|
| committer | David S. Miller <davem@davemloft.net> | 2021-09-14 16:24:31 +0300 |
| commit | d198b27762644c71362e43a7533f89c92b115bcf (patch) | |
| tree | 7650f671289f847a7a157ce5c4d346bcf20d7cfd /net | |
| parent | 4f884f3962767877d7aabbc1ec124d2c307a4257 (diff) | |
| download | linux-d198b27762644c71362e43a7533f89c92b115bcf.tar.xz | |
Revert "Revert "ipv4: fix memory leaks in ip_cmsg_send() callers""
This reverts commit d7807a9adf4856171f8441f13078c33941df48ab.
As mentioned in https://lkml.org/lkml/2021/9/13/1819
5 years old commit 919483096bfe ("ipv4: fix memory leaks in ip_cmsg_send() callers")
was a correct fix.
ip_cmsg_send() can loop over multiple cmsghdr()
If IP_RETOPTS has been successful, but following cmsghdr generates an error,
we do not free ipc.ok
If IP_RETOPTS is not successful, we have freed the allocated temporary space,
not the one currently in ipc.opt.
Sure, code could be refactored, but let's not bring back old bugs.
Fixes: d7807a9adf48 ("Revert "ipv4: fix memory leaks in ip_cmsg_send() callers"")
Signed-off-by: Eric Dumazet <edumazet@google.com>
Cc: Yajun Deng <yajun.deng@linux.dev>
Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'net')
| -rw-r--r-- | net/ipv4/ip_sockglue.c | 2 | ||||
| -rw-r--r-- | net/ipv4/ping.c | 5 | ||||
| -rw-r--r-- | net/ipv4/raw.c | 5 | ||||
| -rw-r--r-- | net/ipv4/udp.c | 5 |
4 files changed, 10 insertions, 7 deletions
diff --git a/net/ipv4/ip_sockglue.c b/net/ipv4/ip_sockglue.c index 7cef9987ab4a..b297bb28556e 100644 --- a/net/ipv4/ip_sockglue.c +++ b/net/ipv4/ip_sockglue.c @@ -279,7 +279,7 @@ int ip_cmsg_send(struct sock *sk, struct msghdr *msg, struct ipcm_cookie *ipc, case IP_RETOPTS: err = cmsg->cmsg_len - sizeof(struct cmsghdr); - /* Our caller is responsible for freeing ipc->opt when err = 0 */ + /* Our caller is responsible for freeing ipc->opt */ err = ip_options_get(net, &ipc->opt, KERNEL_SOCKPTR(CMSG_DATA(cmsg)), err < 40 ? err : 40); diff --git a/net/ipv4/ping.c b/net/ipv4/ping.c index c588f9f2f46c..1e44a43acfe2 100644 --- a/net/ipv4/ping.c +++ b/net/ipv4/ping.c @@ -727,9 +727,10 @@ static int ping_v4_sendmsg(struct sock *sk, struct msghdr *msg, size_t len) if (msg->msg_controllen) { err = ip_cmsg_send(sk, msg, &ipc, false); - if (unlikely(err)) + if (unlikely(err)) { + kfree(ipc.opt); return err; - + } if (ipc.opt) free = 1; } diff --git a/net/ipv4/raw.c b/net/ipv4/raw.c index 1c98063a3ae8..bb446e60cf58 100644 --- a/net/ipv4/raw.c +++ b/net/ipv4/raw.c @@ -562,9 +562,10 @@ static int raw_sendmsg(struct sock *sk, struct msghdr *msg, size_t len) if (msg->msg_controllen) { err = ip_cmsg_send(sk, msg, &ipc, false); - if (unlikely(err)) + if (unlikely(err)) { + kfree(ipc.opt); goto out; - + } if (ipc.opt) free = 1; } diff --git a/net/ipv4/udp.c b/net/ipv4/udp.c index d5f5981d7a43..8851c9463b4b 100644 --- a/net/ipv4/udp.c +++ b/net/ipv4/udp.c @@ -1122,9 +1122,10 @@ int udp_sendmsg(struct sock *sk, struct msghdr *msg, size_t len) if (err > 0) err = ip_cmsg_send(sk, msg, &ipc, sk->sk_family == AF_INET6); - if (unlikely(err < 0)) + if (unlikely(err < 0)) { + kfree(ipc.opt); return err; - + } if (ipc.opt) free = 1; connected = 0; |