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src: Use 1U for bit shifting

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In a few places we take 1 and shift it left repeatedly. So much
that it won't longer fit into signed integer. The problem is that
this is undefined behaviour. Switching to 1U makes us stay within
boundaries.

Signed-off-by: Michal Privoznik <mprivozn@redhat.com>
Reviewed-by: Tim Wiederhake <twiederh@redhat.com>
This commit is contained in:
Michal Privoznik 2021-06-14 12:46:58 +02:00
parent 1ab5a37c4a
commit 2b20f3e0fa
2 changed files with 6 additions and 6 deletions
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2
src/conf/domain_capabilities.h
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@ -231,7 +231,7 @@ virDomainCapsCPUModelsGet(virDomainCapsCPUModels *cpuModels,
const char *name);
#define VIR_DOMAIN_CAPS_ENUM_IS_SET(capsEnum, value) \
((capsEnum).values & (1 << value))
((capsEnum).values & (1U << value))
#define VIR_DOMAIN_CAPS_ENUM_SET(capsEnum, ...) \
do { \

10
src/cpu/cpu_x86.c
View File

@ -2575,12 +2575,12 @@ cpuidSetLeafD(virCPUData *data,
sub1 = *cpuid;
for (sub = 2; sub < 64; sub++) {
if (sub < 32 &&
!(sub0.eax & (1 << sub)) &&
!(sub1.ecx & (1 << sub)))
!(sub0.eax & (1U << sub)) &&
!(sub1.ecx & (1U << sub)))
continue;
if (sub >= 32 &&
!(sub0.edx & (1 << (sub - 32))) &&
!(sub1.edx & (1 << (sub - 32))))
!(sub0.edx & (1U << (sub - 32))) &&
!(sub1.edx & (1U << (sub - 32))))
continue;
cpuid->ecx_in = sub;
@ -2614,7 +2614,7 @@ cpuidSetLeafResID(virCPUData *data,
return -1;
for (sub = 1; sub < 32; sub++) {
if (!(res & (1 << sub)))
if (!(res & (1U << sub)))
continue;
cpuid->ecx_in = sub;
cpuidCall(cpuid);