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| author | David Lambert <dave@lambsys.com> | 2011-03-07 12:00:46 +0200 |
|---|---|---|
| committer | David Woodhouse <David.Woodhouse@intel.com> | 2011-03-11 14:22:49 +0000 |
| commit | e70727e442eb61581f836a9a0ca0c3b70d8a3ff2 (patch) | |
| tree | 52691fbc86e772642978cc09a32eaaf807ef1016 /drivers/mtd | |
| parent | 5d9d9936209e589569a97985285b3282310cf2db (diff) | |
| download | lwn-e70727e442eb61581f836a9a0ca0c3b70d8a3ff2.tar.gz lwn-e70727e442eb61581f836a9a0ca0c3b70d8a3ff2.zip | |
mtd: speedtest: fix integer overflow
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>
Diffstat (limited to 'drivers/mtd')
| -rw-r--r-- | drivers/mtd/tests/mtd_speedtest.c | 14 |
1 files changed, 7 insertions, 7 deletions
diff --git a/drivers/mtd/tests/mtd_speedtest.c b/drivers/mtd/tests/mtd_speedtest.c index 3ce6fce75e07..627d4e2466a3 100644 --- a/drivers/mtd/tests/mtd_speedtest.c +++ b/drivers/mtd/tests/mtd_speedtest.c @@ -314,16 +314,16 @@ static inline void stop_timing(void) static long calc_speed(void) { - long ms, k, speed; + uint64_t k; + long ms; ms = (finish.tv_sec - start.tv_sec) * 1000 + (finish.tv_usec - start.tv_usec) / 1000; - k = goodebcnt * mtd->erasesize / 1024; - if (ms) - speed = (k * 1000) / ms; - else - speed = 0; - return speed; + if (ms == 0) + return 0; + k = goodebcnt * (mtd->erasesize / 1024) * 1000; + do_div(k, ms); + return k; } static int scan_for_bad_eraseblocks(void) |