Messages in this thread | | | From | Santosh Shilimkar <> | Subject | Re: [PATCH v2] net: rds: fix memory leak in rds_recvmsg | Date | Tue, 8 Jun 2021 14:41:38 +0000 |
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On Jun 8, 2021, at 1:06 AM, Pavel Skripkin <paskripkin@gmail.com> wrote: > > Syzbot reported memory leak in rds. The problem > was in unputted refcount in case of error. > > int rds_recvmsg(struct socket *sock, struct msghdr *msg, size_t size, > int msg_flags) > { > ... > > if (!rds_next_incoming(rs, &inc)) { > ... > } > > After this "if" inc refcount incremented and > > if (rds_cmsg_recv(inc, msg, rs)) { > ret = -EFAULT; > goto out; > } > ... > out: > return ret; > } > > in case of rds_cmsg_recv() fail the refcount won't be > decremented. And it's easy to see from ftrace log, that > rds_inc_addref() don't have rds_inc_put() pair in > rds_recvmsg() after rds_cmsg_recv() > > 1) | rds_recvmsg() { > 1) 3.721 us | rds_inc_addref(); > 1) 3.853 us | rds_message_inc_copy_to_user(); > 1) + 10.395 us | rds_cmsg_recv(); > 1) + 34.260 us | } > > Fixes: bdbe6fbc6a2f ("RDS: recv.c") > Reported-and-tested-by: syzbot+5134cdf021c4ed5aaa5f@syzkaller.appspotmail.com > Signed-off-by: Pavel Skripkin <paskripkin@gmail.com> > --- > > Changes in v2: > Changed goto to break. > Looks fine by me. Thanks for the fix.
Acked-by: Santosh Shilimkar <santosh.shilimkar@oracle.com>
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