Tracker / CVE-2021-47249
CVE-2021-47249
In the Linux kernel, the following vulnerability has been resolved: net: rds: fix memory leak in rds_recvmsg 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 | }
Prodotti e versioni affette
| linux | linux_kernel |
|---|---|
| linux | linux_kernel · 2.6.30 → 4.4.274 |
| linux | linux_kernel · 4.10 → 4.14.238 |
| linux | linux_kernel · 4.15 → 4.19.196 |
| linux | linux_kernel · 4.20 → 5.4.128 |
| linux | linux_kernel · 4.5 → 4.9.274 |
| linux | linux_kernel · 5.11 → 5.12.13 |
| linux | linux_kernel · 5.5 → 5.10.46 |