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libvhost-user.c: add assertion to vu_message_read_default

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Explain Coverity that we are not going to overflow vmsg->fds.

Signed-off-by: Vladimir Sementsov-Ogievskiy <vsementsov@yandex-team.ru>
Message-Id: <20230925194040.68592-5-vsementsov@yandex-team.ru>
Reviewed-by: Michael S. Tsirkin <mst@redhat.com>
Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
This commit is contained in:
Vladimir Sementsov-Ogievskiy 2023-09-25 22:40:32 +03:00 • committed by Michael S. Tsirkin
parent f1a153857a
commit a6f4d2ec42
1 changed files with 1 additions and 0 deletions
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subprojects/libvhost-user/libvhost-user.c
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@ -322,6 +322,7 @@ vu_message_read_default(VuDev *dev, int conn_fd, VhostUserMsg *vmsg)
if (cmsg->cmsg_level == SOL_SOCKET && cmsg->cmsg_type == SCM_RIGHTS) { if (cmsg->cmsg_level == SOL_SOCKET && cmsg->cmsg_type == SCM_RIGHTS) {
fd_size = cmsg->cmsg_len - CMSG_LEN(0); fd_size = cmsg->cmsg_len - CMSG_LEN(0);
vmsg->fd_num = fd_size / sizeof(int); vmsg->fd_num = fd_size / sizeof(int);
assert(fd_size < VHOST_MEMORY_BASELINE_NREGIONS);
memcpy(vmsg->fds, CMSG_DATA(cmsg), fd_size); memcpy(vmsg->fds, CMSG_DATA(cmsg), fd_size);
break; break;
} }