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| author | Necip Fazil Yildiran <necip@google.com> | 2020-08-17 15:54:48 +0000 |
|---|---|---|
| committer | David S. Miller <davem@davemloft.net> | 2020-08-17 15:00:41 -0700 |
| commit | 8dfddfb79653df7c38a9c8c4c034f242a36acee9 (patch) | |
| tree | 98fd3a5d768b8aab2f3fea92995bd91f54b23e38 /net/qrtr | |
| parent | bcf7ddb0186d366f761f86196b480ea6dd2dc18c (diff) | |
| download | linux-stable-8dfddfb79653df7c38a9c8c4c034f242a36acee9.tar.gz linux-stable-8dfddfb79653df7c38a9c8c4c034f242a36acee9.tar.bz2 linux-stable-8dfddfb79653df7c38a9c8c4c034f242a36acee9.zip | |
net: qrtr: fix usage of idr in port assignment to socket
Passing large uint32 sockaddr_qrtr.port numbers for port allocation
triggers a warning within idr_alloc() since the port number is cast
to int, and thus interpreted as a negative number. This leads to
the rejection of such valid port numbers in qrtr_port_assign() as
idr_alloc() fails.
To avoid the problem, switch to idr_alloc_u32() instead.
Fixes: bdabad3e363d ("net: Add Qualcomm IPC router")
Reported-by: syzbot+f31428628ef672716ea8@syzkaller.appspotmail.com
Signed-off-by: Necip Fazil Yildiran <necip@google.com>
Reviewed-by: Dmitry Vyukov <dvyukov@google.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'net/qrtr')
| -rw-r--r-- | net/qrtr/qrtr.c | 20 |
1 files changed, 11 insertions, 9 deletions
diff --git a/net/qrtr/qrtr.c b/net/qrtr/qrtr.c index b4c0db0b7d31..90c558f89d46 100644 --- a/net/qrtr/qrtr.c +++ b/net/qrtr/qrtr.c @@ -692,23 +692,25 @@ static void qrtr_port_remove(struct qrtr_sock *ipc) */ static int qrtr_port_assign(struct qrtr_sock *ipc, int *port) { + u32 min_port; int rc; mutex_lock(&qrtr_port_lock); if (!*port) { - rc = idr_alloc(&qrtr_ports, ipc, - QRTR_MIN_EPH_SOCKET, QRTR_MAX_EPH_SOCKET + 1, - GFP_ATOMIC); - if (rc >= 0) - *port = rc; + min_port = QRTR_MIN_EPH_SOCKET; + rc = idr_alloc_u32(&qrtr_ports, ipc, &min_port, QRTR_MAX_EPH_SOCKET, GFP_ATOMIC); + if (!rc) + *port = min_port; } else if (*port < QRTR_MIN_EPH_SOCKET && !capable(CAP_NET_ADMIN)) { rc = -EACCES; } else if (*port == QRTR_PORT_CTRL) { - rc = idr_alloc(&qrtr_ports, ipc, 0, 1, GFP_ATOMIC); + min_port = 0; + rc = idr_alloc_u32(&qrtr_ports, ipc, &min_port, 0, GFP_ATOMIC); } else { - rc = idr_alloc(&qrtr_ports, ipc, *port, *port + 1, GFP_ATOMIC); - if (rc >= 0) - *port = rc; + min_port = *port; + rc = idr_alloc_u32(&qrtr_ports, ipc, &min_port, *port, GFP_ATOMIC); + if (!rc) + *port = min_port; } mutex_unlock(&qrtr_port_lock); |