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syscall: return early on error in Recvmsg

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Currently, Recvmsg may access the rsa buffer even if the underlying syscall
returns an error.

Following the same change done for x/sys/unix.Recvmsg in CL 734740.

For golang/go#76848

Change-Id: I2a145d822442a2033a76f4717317a39010b17bd5
Reviewed-on: https://go-review.googlesource.com/c/go/+/735121
Reviewed-by: Michael Pratt <mpratt@google.com>
LUCI-TryBot-Result: Go LUCI <golang-scoped@luci-project-accounts.iam.gserviceaccount.com>
Reviewed-by: Ian Lance Taylor <iant@golang.org>
Auto-Submit: Tobias Klauser <tobias.klauser@gmail.com>
Reviewed-by: Florian Lehner <lehner.florian86@gmail.com>
Reviewed-by: Carlos Amedee <carlos@golang.org>
This commit is contained in:
Tobias Klauser 2026-01-10 15:56:01 +01:00 • committed by Gopher Robot
parent c61a48619f
commit 1996c22f0a
1 changed files with 3 additions and 0 deletions
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3
src/syscall/syscall_unix.go
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@ -385,6 +385,9 @@ func recvmsgInet6(fd int, p, oob []byte, flags int, from *SockaddrInet6) (n, oob
func Recvmsg(fd int, p, oob []byte, flags int) (n, oobn int, recvflags int, from Sockaddr, err error) {
var rsa RawSockaddrAny
n, oobn, recvflags, err = recvmsgRaw(fd, p, oob, flags, &rsa)
if err != nil {
return
}
// source address is only specified if the socket is unconnected
if rsa.Addr.Family != AF_UNSPEC {
from, err = anyToSockaddr(&rsa)