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proc: do not panic reading bad G struct (#3098)

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Fixes #3095
This commit is contained in:
Alessandro Arzilli
2022-08-09 19:02:55 +02:00
committed by GitHub
parent 65d5eb7380
commit 3de29a88f8
1 changed files with 6 additions and 2 deletions
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8
pkg/proc/variables.go
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@ -896,11 +896,15 @@ func (v *Variable) parseG() (*G, error) {
} }
var stackhi, stacklo uint64 var stackhi, stacklo uint64
if stackVar := v.loadFieldNamed("stack"); /* +rtype stack */ stackVar != nil { if stackVar := v.loadFieldNamed("stack"); /* +rtype stack */ stackVar != nil {
if stackhiVar := stackVar.fieldVariable("hi"); /* +rtype uintptr */ stackhiVar != nil { if stackhiVar := stackVar.fieldVariable("hi"); /* +rtype uintptr */ stackhiVar != nil && stackhiVar.Value != nil {
stackhi, _ = constant.Uint64Val(stackhiVar.Value) stackhi, _ = constant.Uint64Val(stackhiVar.Value)
} else {
unreadable = true
} }
if stackloVar := stackVar.fieldVariable("lo"); /* +rtype uintptr */ stackloVar != nil { if stackloVar := stackVar.fieldVariable("lo"); /* +rtype uintptr */ stackloVar != nil && stackloVar.Value != nil {
stacklo, _ = constant.Uint64Val(stackloVar.Value) stacklo, _ = constant.Uint64Val(stackloVar.Value)
} else {
unreadable = true
} }
} }