[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]
[Qemu-devel] [PATCH 5/5] pvrdma: check return value from pvrdma_idx_ring
From: |
P J P |
Subject: |
[Qemu-devel] [PATCH 5/5] pvrdma: check return value from pvrdma_idx_ring_has_ routines |
Date: |
Tue, 11 Dec 2018 18:56:42 +0530 |
From: Prasad J Pandit <address@hidden>
pvrdma_idx_ring_has_[data/space] routines also return invalid
index PVRDMA_INVALID_IDX[=-1], if ring has no data/space. Check
return value from these routines to avoid plausible infinite loops.
Reported-by: Li Qiang <address@hidden>
Signed-off-by: Prasad J Pandit <address@hidden>
---
hw/rdma/vmw/pvrdma_dev_ring.c | 16 +++++++++++-----
1 file changed, 11 insertions(+), 5 deletions(-)
diff --git a/hw/rdma/vmw/pvrdma_dev_ring.c b/hw/rdma/vmw/pvrdma_dev_ring.c
index 01247fc041..61b6a0a869 100644
--- a/hw/rdma/vmw/pvrdma_dev_ring.c
+++ b/hw/rdma/vmw/pvrdma_dev_ring.c
@@ -73,6 +73,7 @@ out:
void *pvrdma_ring_next_elem_read(PvrdmaRing *ring)
{
+ int e;
unsigned int idx = 0, offset;
/*
@@ -80,7 +81,8 @@ void *pvrdma_ring_next_elem_read(PvrdmaRing *ring)
ring->ring_state->cons_head);
*/
- if (!pvrdma_idx_ring_has_data(ring->ring_state, ring->max_elems, &idx)) {
+ e = pvrdma_idx_ring_has_data(ring->ring_state, ring->max_elems, &idx);
+ if (e <= 0) {
pr_dbg("No more data in ring\n");
return NULL;
}
@@ -105,20 +107,24 @@ void pvrdma_ring_read_inc(PvrdmaRing *ring)
void *pvrdma_ring_next_elem_write(PvrdmaRing *ring)
{
- unsigned int idx, offset, tail;
+ int idx;
+ unsigned int offset, tail;
/*
pr_dbg("%s: t=%d, h=%d\n", ring->name, ring->ring_state->prod_tail,
ring->ring_state->cons_head);
*/
-
- if (!pvrdma_idx_ring_has_space(ring->ring_state, ring->max_elems, &tail)) {
+ idx = pvrdma_idx_ring_has_space(ring->ring_state, ring->max_elems, &tail);
+ if (idx <= 0) {
pr_dbg("CQ is full\n");
return NULL;
}
idx = pvrdma_idx(&ring->ring_state->prod_tail, ring->max_elems);
- /* TODO: tail == idx */
+ if (idx < 0 || tail == idx) {
+ pr_dbg("invalid idx\n");
+ return NULL;
+ }
offset = idx * ring->elem_sz;
return ring->pages[offset / TARGET_PAGE_SIZE] + (offset %
TARGET_PAGE_SIZE);
--
2.19.2
- [Qemu-devel] [PATCH 4/5] pvrdma: release ring object in case of an error, (continued)
- [Qemu-devel] [PATCH 4/5] pvrdma: release ring object in case of an error, P J P, 2018/12/11
- Re: [Qemu-devel] [PATCH 4/5] pvrdma: release ring object in case of an error, Yuval Shaia, 2018/12/11
- Re: [Qemu-devel] [PATCH 4/5] pvrdma: release ring object in case of an error, Yuval Shaia, 2018/12/11
- Re: [Qemu-devel] [PATCH 4/5] pvrdma: release ring object in case of an error, P J P, 2018/12/11
- Re: [Qemu-devel] [PATCH 4/5] pvrdma: release ring object in case of an error, P J P, 2018/12/12
- Re: [Qemu-devel] [PATCH 4/5] pvrdma: release ring object in case of an error, Yuval Shaia, 2018/12/12
- Re: [Qemu-devel] [PATCH 4/5] pvrdma: release ring object in case of an error, Yuval Shaia, 2018/12/12
- Re: [Qemu-devel] [PATCH 4/5] pvrdma: release ring object in case of an error, P J P, 2018/12/12
[Qemu-devel] [PATCH 3/5] pvrdma: check number of pages when creating rings, P J P, 2018/12/11
[Qemu-devel] [PATCH 5/5] pvrdma: check return value from pvrdma_idx_ring_has_ routines,
P J P <=