diff options
Diffstat (limited to 'hw/9pfs')
| -rw-r--r-- | hw/9pfs/9p.c | 33 | ||||
| -rw-r--r-- | hw/9pfs/9p.h | 2 | ||||
| -rw-r--r-- | hw/9pfs/virtio-9p-device.c | 11 | ||||
| -rw-r--r-- | hw/9pfs/xen-9p-backend.c | 13 |
4 files changed, 38 insertions, 21 deletions
diff --git a/hw/9pfs/9p.c b/hw/9pfs/9p.c index 520177f40c..8b247b904e 100644 --- a/hw/9pfs/9p.c +++ b/hw/9pfs/9p.c @@ -2090,22 +2090,29 @@ out_nofid: * with qemu_iovec_destroy(). */ static void v9fs_init_qiov_from_pdu(QEMUIOVector *qiov, V9fsPDU *pdu, - size_t skip, size_t size, + size_t skip, size_t *size, bool is_write) { QEMUIOVector elem; struct iovec *iov; unsigned int niov; + size_t alloc_size = *size + skip; if (is_write) { - pdu->s->transport->init_out_iov_from_pdu(pdu, &iov, &niov, size + skip); + pdu->s->transport->init_out_iov_from_pdu(pdu, &iov, &niov, alloc_size); } else { - pdu->s->transport->init_in_iov_from_pdu(pdu, &iov, &niov, size + skip); + pdu->s->transport->init_in_iov_from_pdu(pdu, &iov, &niov, &alloc_size); + } + + if (alloc_size < skip) { + *size = 0; + } else { + *size = alloc_size - skip; } qemu_iovec_init_external(&elem, iov, niov); qemu_iovec_init(qiov, niov); - qemu_iovec_concat(qiov, &elem, skip, size); + qemu_iovec_concat(qiov, &elem, skip, *size); } static int v9fs_xattr_read(V9fsState *s, V9fsPDU *pdu, V9fsFidState *fidp, @@ -2113,15 +2120,14 @@ static int v9fs_xattr_read(V9fsState *s, V9fsPDU *pdu, V9fsFidState *fidp, { ssize_t err; size_t offset = 7; - uint64_t read_count; + size_t read_count; QEMUIOVector qiov_full; if (fidp->fs.xattr.len < off) { read_count = 0; - } else { + } else if (fidp->fs.xattr.len - off < max_count) { read_count = fidp->fs.xattr.len - off; - } - if (read_count > max_count) { + } else { read_count = max_count; } err = pdu_marshal(pdu, offset, "d", read_count); @@ -2130,7 +2136,7 @@ static int v9fs_xattr_read(V9fsState *s, V9fsPDU *pdu, V9fsFidState *fidp, } offset += err; - v9fs_init_qiov_from_pdu(&qiov_full, pdu, offset, read_count, false); + v9fs_init_qiov_from_pdu(&qiov_full, pdu, offset, &read_count, false); err = v9fs_pack(qiov_full.iov, qiov_full.niov, 0, ((char *)fidp->fs.xattr.value) + off, read_count); @@ -2259,9 +2265,11 @@ static void coroutine_fn v9fs_read(void *opaque) QEMUIOVector qiov_full; QEMUIOVector qiov; int32_t len; + size_t size = max_count; - v9fs_init_qiov_from_pdu(&qiov_full, pdu, offset + 4, max_count, false); + v9fs_init_qiov_from_pdu(&qiov_full, pdu, offset + 4, &size, false); qemu_iovec_init(&qiov, qiov_full.niov); + max_count = size; do { qemu_iovec_reset(&qiov); qemu_iovec_concat(&qiov, &qiov_full, count, qiov_full.size - count); @@ -2504,6 +2512,7 @@ static void coroutine_fn v9fs_write(void *opaque) int32_t len = 0; int32_t total = 0; size_t offset = 7; + size_t size; V9fsFidState *fidp; V9fsPDU *pdu = opaque; V9fsState *s = pdu->s; @@ -2516,7 +2525,9 @@ static void coroutine_fn v9fs_write(void *opaque) return; } offset += err; - v9fs_init_qiov_from_pdu(&qiov_full, pdu, offset, count, true); + size = count; + v9fs_init_qiov_from_pdu(&qiov_full, pdu, offset, &size, true); + count = size; trace_v9fs_write(pdu->tag, pdu->id, fid, off, count, qiov_full.niov); fidp = get_fid(pdu, fid); diff --git a/hw/9pfs/9p.h b/hw/9pfs/9p.h index 3904f82901..8d07a0b301 100644 --- a/hw/9pfs/9p.h +++ b/hw/9pfs/9p.h @@ -425,7 +425,7 @@ struct V9fsTransport { ssize_t (*pdu_vunmarshal)(V9fsPDU *pdu, size_t offset, const char *fmt, va_list ap); void (*init_in_iov_from_pdu)(V9fsPDU *pdu, struct iovec **piov, - unsigned int *pniov, size_t size); + unsigned int *pniov, size_t *size); void (*init_out_iov_from_pdu)(V9fsPDU *pdu, struct iovec **piov, unsigned int *pniov, size_t size); void (*push_and_notify)(V9fsPDU *pdu); diff --git a/hw/9pfs/virtio-9p-device.c b/hw/9pfs/virtio-9p-device.c index b5a7c03f26..991e175c82 100644 --- a/hw/9pfs/virtio-9p-device.c +++ b/hw/9pfs/virtio-9p-device.c @@ -147,19 +147,22 @@ static ssize_t virtio_pdu_vunmarshal(V9fsPDU *pdu, size_t offset, } static void virtio_init_in_iov_from_pdu(V9fsPDU *pdu, struct iovec **piov, - unsigned int *pniov, size_t size) + unsigned int *pniov, size_t *size) { V9fsState *s = pdu->s; V9fsVirtioState *v = container_of(s, V9fsVirtioState, state); VirtQueueElement *elem = v->elems[pdu->idx]; size_t buf_size = iov_size(elem->in_sg, elem->in_num); - if (buf_size < size) { + if (buf_size < P9_IOHDRSZ) { VirtIODevice *vdev = VIRTIO_DEVICE(v); virtio_error(vdev, - "VirtFS reply type %d needs %zu bytes, buffer has %zu", - pdu->id + 1, size, buf_size); + "VirtFS reply type %d needs %zu bytes, buffer has %zu, less than minimum", + pdu->id + 1, *size, buf_size); + } + if (buf_size < *size) { + *size = buf_size; } *piov = elem->in_sg; diff --git a/hw/9pfs/xen-9p-backend.c b/hw/9pfs/xen-9p-backend.c index 71eebe12dd..18fe5b7c92 100644 --- a/hw/9pfs/xen-9p-backend.c +++ b/hw/9pfs/xen-9p-backend.c @@ -187,7 +187,7 @@ static void xen_9pfs_init_out_iov_from_pdu(V9fsPDU *pdu, static void xen_9pfs_init_in_iov_from_pdu(V9fsPDU *pdu, struct iovec **piov, unsigned int *pniov, - size_t size) + size_t *size) { Xen9pfsDev *xen_9pfs = container_of(pdu->s, Xen9pfsDev, state); Xen9pfsRing *ring = &xen_9pfs->rings[pdu->tag % xen_9pfs->num_rings]; @@ -197,16 +197,19 @@ static void xen_9pfs_init_in_iov_from_pdu(V9fsPDU *pdu, g_free(ring->sg); ring->sg = g_new0(struct iovec, 2); - xen_9pfs_in_sg(ring, ring->sg, &num, pdu->idx, size); + xen_9pfs_in_sg(ring, ring->sg, &num, pdu->idx, *size); buf_size = iov_size(ring->sg, num); - if (buf_size < size) { + if (buf_size < P9_IOHDRSZ) { xen_pv_printf(&xen_9pfs->xendev, 0, "Xen 9pfs request type %d" - "needs %zu bytes, buffer has %zu\n", pdu->id, size, - buf_size); + "needs %zu bytes, buffer has %zu, less than minimum\n", + pdu->id, *size, buf_size); xen_be_set_state(&xen_9pfs->xendev, XenbusStateClosing); xen_9pfs_disconnect(&xen_9pfs->xendev); } + if (buf_size < *size) { + *size = buf_size; + } *piov = ring->sg; *pniov = num; |