net/mlx5: fix pattern expansion in RSS flow rules
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Commit Message
Flow rule pattern may be implicitly expanded by the PMD if the rule
has RSS flow action. The expansion adds network headers to the
original pattern. The new pattern lists all network levels that
participate in the rule RSS action.
The patch validates that buffer for expanded pattern has enough bytes
for new flow items.
Fixes: c7870bfe09dc ("ethdev: move RSS expansion code to mlx5 driver")
Cc: stable@dpdk.org
Signed-off-by: Gregory Etelson <getelson@nvidia.com>
Acked-by: Viacheslav Ovsiienko <viacheslavo@nvidia.com>
---
drivers/net/mlx5/mlx5_flow.c | 63 +++++++++++++++++++-----------------
1 file changed, 33 insertions(+), 30 deletions(-)
Comments
Hi,
> -----Original Message-----
> From: Gregory Etelson <getelson@nvidia.com>
> Sent: Wednesday, June 30, 2021 10:20 AM
> To: dev@dpdk.org
> Cc: Gregory Etelson <getelson@nvidia.com>; Matan Azrad
> <matan@nvidia.com>; Raslan Darawsheh <rasland@nvidia.com>;
> stable@dpdk.org; Slava Ovsiienko <viacheslavo@nvidia.com>; Shahaf Shuler
> <shahafs@nvidia.com>; Dekel Peled <dekelp@nvidia.com>; Ferruh Yigit
> <ferruh.yigit@intel.com>
> Subject: [PATCH] net/mlx5: fix pattern expansion in RSS flow rules
>
> Flow rule pattern may be implicitly expanded by the PMD if the rule
> has RSS flow action. The expansion adds network headers to the
> original pattern. The new pattern lists all network levels that
> participate in the rule RSS action.
>
> The patch validates that buffer for expanded pattern has enough bytes
> for new flow items.
>
> Fixes: c7870bfe09dc ("ethdev: move RSS expansion code to mlx5 driver")
>
> Cc: stable@dpdk.org
> Signed-off-by: Gregory Etelson <getelson@nvidia.com>
> Acked-by: Viacheslav Ovsiienko <viacheslavo@nvidia.com>
Patch applied to next-net-mlx,
Kindest regards,
Raslan Darawsheh
@@ -264,6 +264,7 @@ mlx5_flow_expand_rss_item_complete(const struct rte_flow_item *item)
* set, the following errors are defined:
*
* -E2BIG: graph-depth @p graph is too deep.
+ * -EINVAL: @p size has not enough space for expanded pattern.
*/
static int
mlx5_flow_expand_rss(struct mlx5_flow_expand_rss *buf, size_t size,
@@ -290,12 +291,12 @@ mlx5_flow_expand_rss(struct mlx5_flow_expand_rss *buf, size_t size,
memset(&missed_item, 0, sizeof(missed_item));
lsize = offsetof(struct mlx5_flow_expand_rss, entry) +
MLX5_RSS_EXP_ELT_N * sizeof(buf->entry[0]);
- if (lsize <= size) {
- buf->entry[0].priority = 0;
- buf->entry[0].pattern = (void *)&buf->entry[MLX5_RSS_EXP_ELT_N];
- buf->entries = 0;
- addr = buf->entry[0].pattern;
- }
+ if (lsize > size)
+ return -EINVAL;
+ buf->entry[0].priority = 0;
+ buf->entry[0].pattern = (void *)&buf->entry[MLX5_RSS_EXP_ELT_N];
+ buf->entries = 0;
+ addr = buf->entry[0].pattern;
for (item = pattern; item->type != RTE_FLOW_ITEM_TYPE_END; item++) {
if (!mlx5_flow_is_rss_expandable_item(item)) {
user_pattern_size += sizeof(*item);
@@ -313,12 +314,12 @@ mlx5_flow_expand_rss(struct mlx5_flow_expand_rss *buf, size_t size,
}
user_pattern_size += sizeof(*item); /* Handle END item. */
lsize += user_pattern_size;
+ if (lsize > size)
+ return -EINVAL;
/* Copy the user pattern in the first entry of the buffer. */
- if (lsize <= size) {
- rte_memcpy(addr, pattern, user_pattern_size);
- addr = (void *)(((uintptr_t)addr) + user_pattern_size);
- buf->entries = 1;
- }
+ rte_memcpy(addr, pattern, user_pattern_size);
+ addr = (void *)(((uintptr_t)addr) + user_pattern_size);
+ buf->entries = 1;
/* Start expanding. */
memset(flow_items, 0, sizeof(flow_items));
user_pattern_size -= sizeof(*item);
@@ -348,7 +349,9 @@ mlx5_flow_expand_rss(struct mlx5_flow_expand_rss *buf, size_t size,
elt = 2; /* missed item + item end. */
node = next;
lsize += elt * sizeof(*item) + user_pattern_size;
- if ((node->rss_types & types) && lsize <= size) {
+ if (lsize > size)
+ return -EINVAL;
+ if (node->rss_types & types) {
buf->entry[buf->entries].priority = 1;
buf->entry[buf->entries].pattern = addr;
buf->entries++;
@@ -367,6 +370,7 @@ mlx5_flow_expand_rss(struct mlx5_flow_expand_rss *buf, size_t size,
while (node) {
flow_items[stack_pos].type = node->type;
if (node->rss_types & types) {
+ size_t n;
/*
* compute the number of items to copy from the
* expansion and copy it.
@@ -376,24 +380,23 @@ mlx5_flow_expand_rss(struct mlx5_flow_expand_rss *buf, size_t size,
elt = stack_pos + 2;
flow_items[stack_pos + 1].type = RTE_FLOW_ITEM_TYPE_END;
lsize += elt * sizeof(*item) + user_pattern_size;
- if (lsize <= size) {
- size_t n = elt * sizeof(*item);
-
- buf->entry[buf->entries].priority =
- stack_pos + 1 + missed;
- buf->entry[buf->entries].pattern = addr;
- buf->entries++;
- rte_memcpy(addr, buf->entry[0].pattern,
- user_pattern_size);
- addr = (void *)(((uintptr_t)addr) +
- user_pattern_size);
- rte_memcpy(addr, &missed_item,
- missed * sizeof(*item));
- addr = (void *)(((uintptr_t)addr) +
- missed * sizeof(*item));
- rte_memcpy(addr, flow_items, n);
- addr = (void *)(((uintptr_t)addr) + n);
- }
+ if (lsize > size)
+ return -EINVAL;
+ n = elt * sizeof(*item);
+ buf->entry[buf->entries].priority =
+ stack_pos + 1 + missed;
+ buf->entry[buf->entries].pattern = addr;
+ buf->entries++;
+ rte_memcpy(addr, buf->entry[0].pattern,
+ user_pattern_size);
+ addr = (void *)(((uintptr_t)addr) +
+ user_pattern_size);
+ rte_memcpy(addr, &missed_item,
+ missed * sizeof(*item));
+ addr = (void *)(((uintptr_t)addr) +
+ missed * sizeof(*item));
+ rte_memcpy(addr, flow_items, n);
+ addr = (void *)(((uintptr_t)addr) + n);
}
/* Go deeper. */
if (!node->optional && node->next) {