Commit 8bd8e3f2 authored by Vincent BENAYOUN's avatar Vincent BENAYOUN Committed by Luis Henriques

inetdevice: fixed signed integer overflow

commit 84bc8868 upstream.

There could be a signed overflow in the following code.

The expression, (32-logmask) is comprised between 0 and 31 included.
It may be equal to 31.
In such a case the left shift will produce a signed integer overflow.
According to the C99 Standard, this is an undefined behavior.
A simple fix is to replace the signed int 1 with the unsigned int 1U.
Signed-off-by: default avatarVincent BENAYOUN <vincent.benayoun@trust-in-soft.com>
Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
Signed-off-by: default avatarLuis Henriques <luis.henriques@canonical.com>
parent 6153a856
...@@ -242,7 +242,7 @@ static inline void in_dev_put(struct in_device *idev) ...@@ -242,7 +242,7 @@ static inline void in_dev_put(struct in_device *idev)
static __inline__ __be32 inet_make_mask(int logmask) static __inline__ __be32 inet_make_mask(int logmask)
{ {
if (logmask) if (logmask)
return htonl(~((1<<(32-logmask))-1)); return htonl(~((1U<<(32-logmask))-1));
return 0; return 0;
} }
......
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