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ksmbd: Prevent integer overflow in calculation of deadtime

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commit a93ff74282 upstream.

The user can set any value for 'deadtime'. This affects the arithmetic
expression 'req->deadtime * SMB_ECHO_INTERVAL', which is subject to
overflow. The added check makes the server behavior more predictable.

Found by Linux Verification Center (linuxtesting.org) with SVACE.

Fixes: 0626e6641f ("cifsd: add server handler for central processing and tranport layers")
Cc: stable@vger.kernel.org
Signed-off-by: Denis Arefev <arefev@swemel.ru>
Acked-by: Namjae Jeon <linkinjeon@kernel.org>
Signed-off-by: Steve French <stfrench@microsoft.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Denis Arefev
2025-04-09 12:04:49 +03:00
committed by Greg Kroah-Hartman
parent 296cb5457c
commit 160935d81f
1 changed files with 6 additions and 1 deletions
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fs/smb/server/transport_ipc.c
+6 -1
View File
@@ -296,7 +296,11 @@ static int ipc_server_config_on_startup(struct ksmbd_startup_request *req)
server_conf.signing = req->signing;
server_conf.tcp_port = req->tcp_port;
server_conf.ipc_timeout = req->ipc_timeout * HZ;
server_conf.deadtime = req->deadtime * SMB_ECHO_INTERVAL;
if (check_mul_overflow(req->deadtime, SMB_ECHO_INTERVAL,
&server_conf.deadtime)) {
ret = -EINVAL;
goto out;
}
server_conf.share_fake_fscaps = req->share_fake_fscaps;
ksmbd_init_domain(req->sub_auth);
@@ -322,6 +326,7 @@ static int ipc_server_config_on_startup(struct ksmbd_startup_request *req)
ret |= ksmbd_set_work_group(req->work_group);
ret |= ksmbd_tcp_set_interfaces(KSMBD_STARTUP_CONFIG_INTERFACES(req),
req->ifc_list_sz);
out:
if (ret) {
pr_err("Server configuration error: %s %s %s\n",
req->netbios_name, req->server_string,