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net: clear malloc'ed memory in cgoResSearch

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For #61666

Change-Id: I7a0a849fba0abebe28804bdd6d364b154456e399
Reviewed-on: https://go-review.googlesource.com/c/go/+/534516
Run-TryBot: Ian Lance Taylor <iant@golang.org>
TryBot-Result: Gopher Robot <gobot@golang.org>
Reviewed-by: Damien Neil <dneil@google.com>
Auto-Submit: Ian Lance Taylor <iant@google.com>
Reviewed-by: Ian Lance Taylor <iant@google.com>
This commit is contained in:
Ian Lance Taylor 2023-10-11 13:24:54 -07:00 committed by Gopher Robot
parent 655155d0a7
commit 3b0fc5a51f
1 changed files with 9 additions and 2 deletions
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11
src/net/cgo_unix.go
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@ -319,8 +319,15 @@ func cgoResSearch(hostname string, rtype, class int) ([]dnsmessage.Resource, err
acquireThread()
defer releaseThread()
state := (*_C_struct___res_state)(_C_malloc(unsafe.Sizeof(_C_struct___res_state{})))
defer _C_free(unsafe.Pointer(state))
resStateSize := unsafe.Sizeof(_C_struct___res_state{})
var state *_C_struct___res_state
if resStateSize > 0 {
mem := _C_malloc(resStateSize)
defer _C_free(mem)
memSlice := unsafe.Slice((*byte)(mem), resStateSize)
clear(memSlice)
state = (*_C_struct___res_state)(unsafe.Pointer(&memSlice[0]))
}
if err := _C_res_ninit(state); err != nil {
return nil, errors.New("res_ninit failure: " + err.Error())
}