* [PATCH] distributor: fix potential overflow bug
@ 2022-02-17 15:02 Bruce Richardson
2022-02-17 15:24 ` David Hunt
0 siblings, 1 reply; 3+ messages in thread
From: Bruce Richardson @ 2022-02-17 15:02 UTC (permalink / raw)
To: dev; +Cc: David Hunt, Bruce Richardson, stable
Coverity flags the fact that the tag values used in distributor are
32-bit, which means that when we use bit-manipulation to convert a tag
match/no-match to a bit in an array, we need to typecast to a 64-bit
type before shifting past 32 bits.
Coverity issue: 375808
Fixes: 08ccf3faa6a9 ("distributor: new packet distributor library")
Cc: stable@dpdk.org
Signed-off-by: Bruce Richardson <bruce.richardson@intel.com>
---
lib/distributor/rte_distributor_single.c | 3 +--
1 file changed, 1 insertion(+), 2 deletions(-)
diff --git a/lib/distributor/rte_distributor_single.c b/lib/distributor/rte_distributor_single.c
index b653620688..60ca86152f 100644
--- a/lib/distributor/rte_distributor_single.c
+++ b/lib/distributor/rte_distributor_single.c
@@ -247,8 +247,7 @@ rte_distributor_process_single(struct rte_distributor_single *d,
* worker given by the bit-position
*/
for (i = 0; i < d->num_workers; i++)
- match |= (!(d->in_flight_tags[i] ^ new_tag)
- << i);
+ match |= ((uint64_t)!(d->in_flight_tags[i] ^ new_tag) << i);
/* Only turned-on bits are considered as match */
match &= d->in_flight_bitmask;
--
2.32.0
^ permalink raw reply [flat|nested] 3+ messages in thread
* Re: [PATCH] distributor: fix potential overflow bug
2022-02-17 15:02 [PATCH] distributor: fix potential overflow bug Bruce Richardson
@ 2022-02-17 15:24 ` David Hunt
2022-02-27 18:07 ` Thomas Monjalon
0 siblings, 1 reply; 3+ messages in thread
From: David Hunt @ 2022-02-17 15:24 UTC (permalink / raw)
To: Bruce Richardson, dev; +Cc: stable
Hi Bruce,
On 17/2/2022 3:02 PM, Bruce Richardson wrote:
> Coverity flags the fact that the tag values used in distributor are
> 32-bit, which means that when we use bit-manipulation to convert a tag
> match/no-match to a bit in an array, we need to typecast to a 64-bit
> type before shifting past 32 bits.
>
> Coverity issue: 375808
> Fixes: 08ccf3faa6a9 ("distributor: new packet distributor library")
> Cc: stable@dpdk.org
>
> Signed-off-by: Bruce Richardson <bruce.richardson@intel.com>
> ---
> lib/distributor/rte_distributor_single.c | 3 +--
> 1 file changed, 1 insertion(+), 2 deletions(-)
>
> diff --git a/lib/distributor/rte_distributor_single.c b/lib/distributor/rte_distributor_single.c
> index b653620688..60ca86152f 100644
> --- a/lib/distributor/rte_distributor_single.c
> +++ b/lib/distributor/rte_distributor_single.c
> @@ -247,8 +247,7 @@ rte_distributor_process_single(struct rte_distributor_single *d,
> * worker given by the bit-position
> */
> for (i = 0; i < d->num_workers; i++)
> - match |= (!(d->in_flight_tags[i] ^ new_tag)
> - << i);
> + match |= ((uint64_t)!(d->in_flight_tags[i] ^ new_tag) << i);
>
> /* Only turned-on bits are considered as match */
> match &= d->in_flight_bitmask;
LGTM
Acked-by: David Hunt <david.hunt@intel.com>
^ permalink raw reply [flat|nested] 3+ messages in thread
* Re: [PATCH] distributor: fix potential overflow bug
2022-02-17 15:24 ` David Hunt
@ 2022-02-27 18:07 ` Thomas Monjalon
0 siblings, 0 replies; 3+ messages in thread
From: Thomas Monjalon @ 2022-02-27 18:07 UTC (permalink / raw)
To: Bruce Richardson; +Cc: dev, stable, David Hunt
17/02/2022 16:24, David Hunt:
> Hi Bruce,
>
> On 17/2/2022 3:02 PM, Bruce Richardson wrote:
> > Coverity flags the fact that the tag values used in distributor are
> > 32-bit, which means that when we use bit-manipulation to convert a tag
> > match/no-match to a bit in an array, we need to typecast to a 64-bit
> > type before shifting past 32 bits.
> >
> > Coverity issue: 375808
> > Fixes: 08ccf3faa6a9 ("distributor: new packet distributor library")
> > Cc: stable@dpdk.org
> >
> > Signed-off-by: Bruce Richardson <bruce.richardson@intel.com>
>
> LGTM
>
> Acked-by: David Hunt <david.hunt@intel.com>
Applied, thanks.
^ permalink raw reply [flat|nested] 3+ messages in thread
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2022-02-17 15:24 ` David Hunt
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