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Trap possible overflow in usec values to netem 

If user asks for large usec value it could overflow 32 bits.

Signed-off-by: Stephen Hemminger <shemminger@osdl.org>
This commit is contained in:
Stephen Hemminger 2006-10-19 13:10:26 -07:00
parent 69d25465c9
commit fa56513034
3 changed files with 15 additions and 0 deletions
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5
tc/q_netem.c
View File

@ -111,6 +111,11 @@ static int get_ticks(__u32 *ticks, const char *str)
if(get_usecs(&t, str))
return -1;
if (tc_core_usec2big(t)) {
fprintf(stderr, "Illegal %d usecs (too large)\n", t);
return -1;
}
*ticks = tc_core_usec2tick(t);
return 0;
}

9
tc/tc_core.c
View File

@ -27,6 +27,15 @@ static __u32 t2us=1;
static __u32 us2t=1;
static double tick_in_usec = 1;
int tc_core_usec2big(long usec)
{
__u64 t = usec;
t *= tick_in_usec;
return (t >> 32) != 0;
}
long tc_core_usec2tick(long usec)
{
return usec*tick_in_usec;

1
tc/tc_core.h
View File

@ -4,6 +4,7 @@
#include <asm/types.h>
#include <linux/pkt_sched.h>
int tc_core_usec2big(long usec);
long tc_core_usec2tick(long usec);
long tc_core_tick2usec(long tick);
unsigned tc_calc_xmittime(unsigned rate, unsigned size);