Skip to content
GitLab
Projects
Groups
Snippets
/
Help
Help
Support
Community forum
Keyboard shortcuts
?
Submit feedback
Contribute to GitLab
Sign in / Register
Toggle navigation
Menu
Open sidebar
xcap
xcap-capability-linux
Commits
0ba7a3ba
Commit
0ba7a3ba
authored
Sep 09, 2005
by
Arnaldo Carvalho de Melo
Browse files
[CCID3] Avoid unsigned integer overflows in usecs_div
Signed-off-by:
Arnaldo Carvalho de Melo
<
acme@mandriva.com
>
parent
e104411b
Changes
1
Hide whitespace changes
Inline
Side-by-side
net/dccp/ccids/ccid3.c
View file @
0ba7a3ba
...
...
@@ -43,12 +43,22 @@
#include
"ccid3.h"
/*
* Reason for maths with 10 here is to avoid 32 bit overflow when a is big.
* Reason for maths here is to avoid 32 bit overflow when a is big.
* With this we get close to the limit.
*/
static
inline
u32
usecs_div
(
const
u32
a
,
const
u32
b
)
{
const
u32
tmp
=
a
*
(
USEC_PER_SEC
/
10
);
return
b
>
20
?
tmp
/
(
b
/
10
)
:
tmp
;
const
u32
div
=
a
<
(
UINT_MAX
/
(
USEC_PER_SEC
/
10
))
?
10
:
a
<
(
UINT_MAX
/
(
USEC_PER_SEC
/
50
))
?
50
:
a
<
(
UINT_MAX
/
(
USEC_PER_SEC
/
100
))
?
100
:
a
<
(
UINT_MAX
/
(
USEC_PER_SEC
/
500
))
?
500
:
a
<
(
UINT_MAX
/
(
USEC_PER_SEC
/
1000
))
?
1000
:
a
<
(
UINT_MAX
/
(
USEC_PER_SEC
/
5000
))
?
5000
:
a
<
(
UINT_MAX
/
(
USEC_PER_SEC
/
10000
))
?
10000
:
a
<
(
UINT_MAX
/
(
USEC_PER_SEC
/
50000
))
?
50000
:
100000
;
const
u32
tmp
=
a
*
(
USEC_PER_SEC
/
div
);
return
(
b
>=
2
*
div
)
?
tmp
/
(
b
/
div
)
:
tmp
;
}
static
int
ccid3_debug
;
...
...
Write
Preview
Supports
Markdown
0%
Try again
or
attach a new file
.
Cancel
You are about to add
0
people
to the discussion. Proceed with caution.
Finish editing this message first!
Cancel
Please
register
or
sign in
to comment