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| author | Colin Ian King <colin.king@canonical.com> | 2019-01-15 18:03:38 +0000 |
|---|---|---|
| committer | David S. Miller <davem@davemloft.net> | 2019-01-17 11:27:00 -0800 |
| commit | cb12d72b27a6f41325ae23a11033cf5fedfa1b97 (patch) | |
| tree | 766c9eab37443392f4603bc802e8fe88c960830f | |
| parent | 0f149c9fec3cd720628ecde83bfc6f64c1e7dcb6 (diff) | |
| download | linux-cb12d72b27a6f41325ae23a11033cf5fedfa1b97.tar.gz linux-cb12d72b27a6f41325ae23a11033cf5fedfa1b97.tar.bz2 linux-cb12d72b27a6f41325ae23a11033cf5fedfa1b97.zip | |
atm: he: fix sign-extension overflow on large shift
Shifting the 1 by exp by an int can lead to sign-extension overlow when
exp is 31 since 1 is an signed int and sign-extending this result to an
unsigned long long will set the upper 32 bits. Fix this by shifting an
unsigned long.
Detected by cppcheck:
(warning) Shifting signed 32-bit value by 31 bits is undefined behaviour
Signed-off-by: Colin Ian King <colin.king@canonical.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
| -rw-r--r-- | drivers/atm/he.c | 2 |
1 files changed, 1 insertions, 1 deletions
diff --git a/drivers/atm/he.c b/drivers/atm/he.c index 2e9d1cfe3aeb..211607986134 100644 --- a/drivers/atm/he.c +++ b/drivers/atm/he.c @@ -718,7 +718,7 @@ static int he_init_cs_block_rcm(struct he_dev *he_dev) instead of '/ 512', use '>> 9' to prevent a call to divdu3 on x86 platforms */ - rate_cps = (unsigned long long) (1 << exp) * (man + 512) >> 9; + rate_cps = (unsigned long long) (1UL << exp) * (man + 512) >> 9; if (rate_cps < 10) rate_cps = 10; /* 2.2.1 minimum payload rate is 10 cps */ |