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| author | Colin Ian King <colin.king@canonical.com> | 2019-01-15 18:03:38 +0000 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2019-02-27 10:06:59 +0100 |
| commit | 364f3761461395230ee45ed54c1962649df9e640 (patch) | |
| tree | 1999ff4f1a6fe492f4da53a73645333001d8d9a9 | |
| parent | 46154d295b82ff4f470dd3934440433ce333825b (diff) | |
atm: he: fix sign-extension overflow on large shift
[ Upstream commit cb12d72b27a6f41325ae23a11033cf5fedfa1b97 ]
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>
Signed-off-by: Sasha Levin <sashal@kernel.org>
| -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 31b513a23ae0..985a5800a637 100644 --- a/drivers/atm/he.c +++ b/drivers/atm/he.c @@ -717,7 +717,7 @@ 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 */ |