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[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index] [qemu-xen stable-4.14] Revert "9p: init_in_iov_from_pdu can truncate the size"
commit b38d9cada46ba6229ed6c87bf777cecb24af0c6b
Author: Stefano Stabellini <stefano.stabellini@xxxxxxxxxx>
AuthorDate: Thu May 21 12:26:25 2020 -0700
Commit: Michael Roth <mdroth@xxxxxxxxxxxxxxxxxx>
CommitDate: Mon Aug 24 19:11:14 2020 -0500
Revert "9p: init_in_iov_from_pdu can truncate the size"
This reverts commit 16724a173049ac29c7b5ade741da93a0f46edff7.
It causes https://bugs.launchpad.net/bugs/1877688.
Signed-off-by: Stefano Stabellini <stefano.stabellini@xxxxxxxxxx>
Reviewed-by: Christian Schoenebeck <qemu_oss@xxxxxxxxxxxxx>
Message-Id: <20200521192627.15259-1-sstabellini@xxxxxxxxxx>
Signed-off-by: Greg Kurz <groug@xxxxxxxx>
(cherry picked from commit cf45183b718f02b1369e18c795dc51bc1821245d)
Signed-off-by: Michael Roth <mdroth@xxxxxxxxxxxxxxxxxx>
---
hw/9pfs/9p.c | 33 +++++++++++----------------------
hw/9pfs/9p.h | 2 +-
hw/9pfs/virtio-9p-device.c | 11 ++++-------
hw/9pfs/xen-9p-backend.c | 15 ++++++---------
4 files changed, 22 insertions(+), 39 deletions(-)
diff --git a/hw/9pfs/9p.c b/hw/9pfs/9p.c
index 3301e82eb6..1b729af6e8 100644
--- a/hw/9pfs/9p.c
+++ b/hw/9pfs/9p.c
@@ -2103,29 +2103,22 @@ 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, alloc_size);
+ pdu->s->transport->init_out_iov_from_pdu(pdu, &iov, &niov, size +
skip);
} else {
- pdu->s->transport->init_in_iov_from_pdu(pdu, &iov, &niov, &alloc_size);
- }
-
- if (alloc_size < skip) {
- *size = 0;
- } else {
- *size = alloc_size - skip;
+ pdu->s->transport->init_in_iov_from_pdu(pdu, &iov, &niov, 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,
@@ -2133,14 +2126,15 @@ static int v9fs_xattr_read(V9fsState *s, V9fsPDU *pdu,
V9fsFidState *fidp,
{
ssize_t err;
size_t offset = 7;
- size_t read_count;
+ uint64_t read_count;
QEMUIOVector qiov_full;
if (fidp->fs.xattr.len < off) {
read_count = 0;
- } else if (fidp->fs.xattr.len - off < max_count) {
- read_count = fidp->fs.xattr.len - off;
} else {
+ read_count = fidp->fs.xattr.len - off;
+ }
+ if (read_count > max_count) {
read_count = max_count;
}
err = pdu_marshal(pdu, offset, "d", read_count);
@@ -2149,7 +2143,7 @@ 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);
@@ -2278,11 +2272,9 @@ 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, &size, false);
+ v9fs_init_qiov_from_pdu(&qiov_full, pdu, offset + 4, max_count, 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);
@@ -2533,7 +2525,6 @@ 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;
@@ -2546,9 +2537,7 @@ static void coroutine_fn v9fs_write(void *opaque)
return;
}
offset += err;
- size = count;
- v9fs_init_qiov_from_pdu(&qiov_full, pdu, offset, &size, true);
- count = size;
+ v9fs_init_qiov_from_pdu(&qiov_full, pdu, offset, count, true);
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 c381fe091a..656527beb9 100644
--- a/hw/9pfs/9p.h
+++ b/hw/9pfs/9p.h
@@ -436,7 +436,7 @@ 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 536447a355..f821236356 100644
--- a/hw/9pfs/virtio-9p-device.c
+++ b/hw/9pfs/virtio-9p-device.c
@@ -147,22 +147,19 @@ 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 < P9_IOHDRSZ) {
+ if (buf_size < size) {
VirtIODevice *vdev = VIRTIO_DEVICE(v);
virtio_error(vdev,
- "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;
+ "VirtFS reply type %d needs %zu bytes, buffer has %zu",
+ pdu->id + 1, size, buf_size);
}
*piov = elem->in_sg;
diff --git a/hw/9pfs/xen-9p-backend.c b/hw/9pfs/xen-9p-backend.c
index f04caabfe5..fc197f6c8a 100644
--- a/hw/9pfs/xen-9p-backend.c
+++ b/hw/9pfs/xen-9p-backend.c
@@ -188,7 +188,7 @@ 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];
@@ -198,19 +198,16 @@ 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 < P9_IOHDRSZ) {
- xen_pv_printf(&xen_9pfs->xendev, 0, "Xen 9pfs reply type %d needs "
- "%zu bytes, buffer has %zu, less than minimum\n",
- pdu->id + 1, *size, buf_size);
+ if (buf_size < size) {
+ xen_pv_printf(&xen_9pfs->xendev, 0, "Xen 9pfs request type %d"
+ "needs %zu bytes, buffer has %zu\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;
--
generated by git-patchbot for /home/xen/git/qemu-xen.git#stable-4.14
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