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| author | Ben Pfaff <blp@nicira.com> | 2014-07-09 10:31:22 -0700 |
|---|---|---|
| committer | Jiri Slaby <jslaby@suse.cz> | 2014-07-29 17:01:37 +0200 |
| commit | 8df19ce788d3d18eb4054862daa55a7ee4c883b0 (patch) | |
| tree | adc9cc55d54119c10e9ee24bfdb48ae476c1736d | |
| parent | 477e05a67bb496ecbecceafa502e4f1af31a360a (diff) | |
| download | lwn-8df19ce788d3d18eb4054862daa55a7ee4c883b0.tar.gz lwn-8df19ce788d3d18eb4054862daa55a7ee4c883b0.zip | |
netlink: Fix handling of error from netlink_dump().
[ Upstream commit ac30ef832e6af0505b6f0251a6659adcfa74975e ]
netlink_dump() returns a negative errno value on error. Until now,
netlink_recvmsg() directly recorded that negative value in sk->sk_err, but
that's wrong since sk_err takes positive errno values. (This manifests as
userspace receiving a positive return value from the recv() system call,
falsely indicating success.) This bug was introduced in the commit that
started checking the netlink_dump() return value, commit b44d211 (netlink:
handle errors from netlink_dump()).
Multithreaded Netlink dumps are one way to trigger this behavior in
practice, as described in the commit message for the userspace workaround
posted here:
http://openvswitch.org/pipermail/dev/2014-June/042339.html
This commit also fixes the same bug in netlink_poll(), introduced in commit
cd1df525d (netlink: add flow control for memory mapped I/O).
Signed-off-by: Ben Pfaff <blp@nicira.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Jiri Slaby <jslaby@suse.cz>
| -rw-r--r-- | net/netlink/af_netlink.c | 4 |
1 files changed, 2 insertions, 2 deletions
diff --git a/net/netlink/af_netlink.c b/net/netlink/af_netlink.c index e6d457c4a4e4..d9a2598a5190 100644 --- a/net/netlink/af_netlink.c +++ b/net/netlink/af_netlink.c @@ -628,7 +628,7 @@ static unsigned int netlink_poll(struct file *file, struct socket *sock, while (nlk->cb_running && netlink_dump_space(nlk)) { err = netlink_dump(sk); if (err < 0) { - sk->sk_err = err; + sk->sk_err = -err; sk->sk_error_report(sk); break; } @@ -2440,7 +2440,7 @@ static int netlink_recvmsg(struct kiocb *kiocb, struct socket *sock, atomic_read(&sk->sk_rmem_alloc) <= sk->sk_rcvbuf / 2) { ret = netlink_dump(sk); if (ret) { - sk->sk_err = ret; + sk->sk_err = -ret; sk->sk_error_report(sk); } } |