korg/linux
0
0
Fork 0
mirror of https://mirrors.bfsu.edu.cn/git/linux.git synced 2025-01-18 20:04:16 +08:00
Code Issues Packages Projects Releases Wiki Activity

mtd: speedtest: fix integer overflow

Browse Source 
32-bit integers used in 'calc_speed()' may overflow and lead to
incorrect results. Use 64-bit integers instead.

Signed-off-by: David Lambert <dave@lambsys.com>
Signed-off-by: Artem Bityutskiy <Artem.Bityutskiy@nokia.com>
Signed-off-by: David Woodhouse <David.Woodhouse@intel.com>
This commit is contained in:
David Lambert 2011-03-07 12:00:46 +02:00 committed by David Woodhouse
parent 5d9d993620
commit e70727e442
1 changed files with 7 additions and 7 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

14
drivers/mtd/tests/mtd_speedtest.c
View File

@ -314,16 +314,16 @@ static inline void stop_timing(void)
static long calc_speed(void) static long calc_speed(void)
{ {
long ms, k, speed; uint64_t k;
long ms;
ms = (finish.tv_sec - start.tv_sec) * 1000 + ms = (finish.tv_sec - start.tv_sec) * 1000 +
(finish.tv_usec - start.tv_usec) / 1000; (finish.tv_usec - start.tv_usec) / 1000;
k = goodebcnt * mtd->erasesize / 1024; if (ms == 0)
if (ms) return 0;
speed = (k * 1000) / ms; k = goodebcnt * (mtd->erasesize / 1024) * 1000;
else do_div(k, ms);
speed = 0; return k;
return speed;
} }
static int scan_for_bad_eraseblocks(void) static int scan_for_bad_eraseblocks(void)