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Mon, 19 Oct 2020 06:28:21 +0000 (UTC) Subject: Re: [RFC] can: can_create_echo_skb(): fix echo skb generation: always use skb_clone() To: Oliver Hartkopp , Oleksij Rempel , dev.kurt@vandijck-laurijssen.be, wg@grandegger.com Cc: netdev@vger.kernel.org, kernel@pengutronix.de, linux-can@vger.kernel.org References: <20200124132656.22156-1-o.rempel@pengutronix.de> <20200214120948.4sjnqn2jvndldphw@pengutronix.de> <9ad203ae-9a50-3d96-1ac9-3e45ca9c1989@hartkopp.net> From: Marc Kleine-Budde Autocrypt: addr=mkl@pengutronix.de; prefer-encrypt=mutual; keydata= mQINBFFVq30BEACtnSvtXHoeHJxG6nRULcvlkW6RuNwHKmrqoksispp43X8+nwqIFYgb8UaX zu8T6kZP2wEIpM9RjEL3jdBjZNCsjSS6x1qzpc2+2ivjdiJsqeaagIgvy2JWy7vUa4/PyGfx QyUeXOxdj59DvLwAx8I6hOgeHx2X/ntKAMUxwawYfPZpP3gwTNKc27dJWSomOLgp+gbmOmgc 6U5KwhAxPTEb3CsT5RicsC+uQQFumdl5I6XS+pbeXZndXwnj5t84M+HEj7RN6bUfV2WZO/AB Xt5+qFkC/AVUcj/dcHvZwQJlGeZxoi4veCoOT2MYqfR0ax1MmN+LVRvKm29oSyD4Ts/97cbs XsZDRxnEG3z/7Winiv0ZanclA7v7CQwrzsbpCv+oj+zokGuKasofzKdpywkjAfSE1zTyF+8K nxBAmzwEqeQ3iKqBc3AcCseqSPX53mPqmwvNVS2GqBpnOfY7Mxr1AEmxdEcRYbhG6Xdn+ACq Dq0Db3A++3PhMSaOu125uIAIwMXRJIzCXYSqXo8NIeo9tobk0C/9w3fUfMTrBDtSviLHqlp8 eQEP8+TDSmRP/CwmFHv36jd+XGmBHzW5I7qw0OORRwNFYBeEuiOIgxAfjjbLGHh9SRwEqXAL kw+WVTwh0MN1k7I9/CDVlGvc3yIKS0sA+wudYiselXzgLuP5cQARAQABtCZNYXJjIEtsZWlu ZS1CdWRkZSA8bWtsQHBlbmd1dHJvbml4LmRlPokCVAQTAQoAPgIbAwIeAQIXgAULCQgHAwUV CgkICwUWAgMBABYhBMFAC6CzmJ5vvH1bXCte4hHFiupUBQJfEWX4BQkQo2czAAoJECte4hHF iupUvfMP/iNtiysSr5yU4tbMBzRkGov1/FjurfH1kPweLVHDwiQJOGBz9HgM5+n8boduRv36 0lU32g3PehN0UHZdHWhygUd6J09YUi2mJo1l2Fz1fQ8elUGUOXpT/xoxNQjslZjJGItCjza8 +D1DO+0cNFgElcNPa7DFBnglatOCZRiMjo4Wx0i8njEVRU+4ySRU7rCI36KPts+uVmZAMD7V 3qiR1buYklJaPCJsnXURXYsilBIE9mZRmQjTDVqjLWAit++flqUVmDjaD/pj2AQe2Jcmd2gm sYW5P1moz7ACA1GzMjLDmeFtpJOIB7lnDX0F/vvsG3V713/701aOzrXqBcEZ0E4aWeZJzaXw n1zVIrl/F3RKrWDhMKTkjYy7HA8hQ9SJApFXsgP334Vo0ea82H3dOU755P89+Eoj0y44MbQX 7xUy4UTRAFydPl4pJskveHfg4dO6Yf0PGIvVWOY1K04T1C5dpnHAEMvVNBrfTA8qcahRN82V /iIGB+KSC2xR79q1kv1oYn0GOnWkvZmMhqGLhxIqHYitwH4Jn5uRfanKYWBk12LicsjRiTyW Z9cJf2RgAtQgvMPvmaOL8vB3U4ava48qsRdgxhXMagU618EszVdYRNxGLCqsKVYIDySTrVzu ZGs2ibcRhN4TiSZjztWBAe1MaaGk05Ce4h5IdDLbOOxhuQENBF8SDLABCADohJLQ5yffd8Sq 8Lo9ymzgaLcWboyZ46pY4CCCcAFDRh++QNOJ8l4mEJMNdEa/yrW4lDQDhBWV75VdBuapYoal LFrSzDzrqlHGG4Rt4/XOqMo6eSeSLipYBu4Xhg59S9wZOWbHVT/6vZNmiTa3d40+gBg68dQ8 iqWSU5NhBJCJeLYdG6xxeUEtsq/25N1erxmhs/9TD0sIeX36rFgWldMwKmZPe8pgZEv39Sdd B+ykOlRuHag+ySJxwovfdVoWT0o0LrGlHzAYo6/ZSi/Iraa9R/7A1isWOBhw087BMNkRYx36 B77E4KbyBPx9h3wVyD/R6T0Q3ZNPu6SQLnsWojMzABEBAAGJAjwEGAEKACYWIQTBQAugs5ie b7x9W1wrXuIRxYrqVAUCXxIMsAIbDAUJAucGAAAKCRArXuIRxYrqVOu0D/48xSLyVZ5NN2Bb yqo3zxdv/PMGJSzM3JqSv7hnMZPQGy9XJaTc5Iz/hyXaNRwpH5X0UNKqhQhlztChuAKZ7iu+ 2VKzq4JJe9qmydRUwylluc4HmGwlIrDNvE0N66pRvC3h8tOVIsippAQlt5ciH74bJYXr0PYw Aksw1jugRxMbNRzgGECg4O6EBNaHwDzsVPX1tDj0d9t/7ClzJUy20gg8r9Wm/I/0rcNkQOpV RJLDtSbGSusKxor2XYmVtHGauag4YO6Vdq+2RjArB3oNLgSOGlYVpeqlut+YYHjWpaX/cTf8 /BHtIQuSAEu/WnycpM3Z9aaLocYhbp5lQKL6/bcWQ3udd0RfFR/Gv7eR7rn3evfqNTtQdo4/ YNmd7P8TS7ALQV/5bNRe+ROLquoAZvhaaa6SOvArcmFccnPeyluX8+o9K3BCdXPwONhsrxGO wrPI+7XKMlwWI3O076NqNshh6mm8NIC0mDUr7zBUITa67P3Q2VoPoiPkCL9RtsXdQx5BI9iI h/6QlzDxcBdw2TVWyGkVTCdeCBpuRndOMVmfjSWdCXXJCLXO6sYeculJyPkuNvumxgwUiK/H AqqdUfy1HqtzP2FVhG5Ce0TeMJepagR2CHPXNg88Xw3PDjzdo+zNpqPHOZVKpLUkCvRv1p1q m1qwQVWtAwMML/cuPga78rkBDQRfEXGWAQgAt0Cq8SRiLhWyTqkf16Zv/GLkUgN95RO5ntYM fnc2Tr3UlRq2Cqt+TAvB928lN3WHBZx6DkuxRM/Y/iSyMuhzL5FfhsICuyiBs5f3QG70eZx+ Bdj4I7LpnIAzmBdNWxMHpt0m7UnkNVofA0yH6rcpCsPrdPRJNOLFI6ZqXDQk9VF+AB4HVAJY BDU3NAHoyVGdMlcxev0+gEXfBQswEcysAyvzcPVTAqmrDsupnIB2f0SDMROQCLO6F+/cLG4L Stbz+S6YFjESyXblhLckTiPURvDLTywyTOxJ7Mafz6ZCene9uEOqyd/h81nZOvRd1HrXjiTE 1CBw+Dbvbch1ZwGOTQARAQABiQNyBBgBCgAmFiEEwUALoLOYnm+8fVtcK17iEcWK6lQFAl8R cZYCGwIFCQLnoRoBQAkQK17iEcWK6lTAdCAEGQEKAB0WIQQreQhYm33JNgw/d6GpyVqK+u3v qQUCXxFxlgAKCRCpyVqK+u3vqatQCAC3QIk2Y0g/07xNLJwhWcD7JhIqfe7Qc5Vz9kf8ZpWr +6w4xwRfjUSmrXz3s6e/vrQsfdxjVMDFOkyG8c6DWJo0TVm6Ucrf9G06fsjjE/6cbE/gpBkk /hOVz/a7UIELT+HUf0zxhhu+C9hTSl8Nb0bwtm6JuoY5AW0LP2KoQ6LHXF9KNeiJZrSzG6WE h7nf3KRFS8cPKe+trbujXZRb36iIYUfXKiUqv5xamhohy1hw+7Sy8nLmw8rZPa40bDxX0/Gi 98eVyT4/vi+nUy1gF1jXgNBSkbTpbVwNuldBsGJsMEa8lXnYuLzn9frLdtufUjjCymdcV/iT sFKziU9AX7TLZ5AP/i1QMP9OlShRqERH34ufA8zTukNSBPIBfmSGUe6G2KEWjzzNPPgcPSZx Do4jfQ/m/CiiibM6YCa51Io72oq43vMeBwG9/vLdyev47bhSfMLTpxdlDJ7oXU9e8J61iAF7 vBwerBZL94I3QuPLAHptgG8zPGVzNKoAzxjlaxI1MfqAD9XUM80MYBVjunIQlkU/AubdvmMY X7hY1oMkTkC5hZNHLgIsDvWUG0g3sACfqF6gtMHY2lhQ0RxgxAEx+ULrk/svF6XGDe6iveyc z5Mg5SUggw3rMotqgjMHHRtB3nct6XqgPXVDGYR7nAkXitG+nyG5zWhbhRDglVZ0mLlW9hij z3Emwa94FaDhN2+1VqLFNZXhLwrNC5mlA6LUjCwOL+zb9a07HyjekLyVAdA6bZJ5BkSXJ1CO 5YeYolFjr4YU7GXcSVfUR6fpxrb8N+yH+kJhY3LmS9vb2IXxneE/ESkXM6a2YAZWfW8sgwTm 0yCEJ41rW/p3UpTV9wwE2VbGD1XjzVKl8SuAUfjjcGGys3yk5XQ5cccWTCwsVdo2uAcY1MVM HhN6YJjnMqbFoHQq0H+2YenTlTBn2Wsp8TIytE1GL6EbaPWbMh3VLRcihlMj28OUWGSERxat xlygDG5cBiY3snN3xJyBroh5xk/sHRgOdHpmujnFyu77y4RTZ2W8 Message-ID: <4e794974-8b87-9961-a144-fe9f5c236de6@pengutronix.de> Date: Mon, 19 Oct 2020 08:28:16 +0200 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:68.0) Gecko/20100101 Thunderbird/68.12.0 MIME-Version: 1.0 In-Reply-To: <9ad203ae-9a50-3d96-1ac9-3e45ca9c1989@hartkopp.net> Content-Type: multipart/signed; micalg=pgp-sha512; protocol="application/pgp-signature"; boundary="tmTWZElo08yWeQ31SenvOyzr931fUdJRw" X-SA-Exim-Connect-IP: 2001:67c:670:201:5054:ff:fe8d:eefb X-SA-Exim-Mail-From: mkl@pengutronix.de X-SA-Exim-Scanned: No (on metis.ext.pengutronix.de); SAEximRunCond expanded to false X-PTX-Original-Recipient: netdev@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: netdev@vger.kernel.org This is an OpenPGP/MIME signed message (RFC 4880 and 3156) --tmTWZElo08yWeQ31SenvOyzr931fUdJRw Content-Type: multipart/mixed; boundary="jatEB1sZkAVzPFLV1EmwwPFoVIm76xQ0l"; protected-headers="v1" From: Marc Kleine-Budde To: Oliver Hartkopp , Oleksij Rempel , dev.kurt@vandijck-laurijssen.be, wg@grandegger.com Cc: netdev@vger.kernel.org, kernel@pengutronix.de, linux-can@vger.kernel.org Message-ID: <4e794974-8b87-9961-a144-fe9f5c236de6@pengutronix.de> Subject: Re: [RFC] can: can_create_echo_skb(): fix echo skb generation: always use skb_clone() References: <20200124132656.22156-1-o.rempel@pengutronix.de> <20200214120948.4sjnqn2jvndldphw@pengutronix.de> <9ad203ae-9a50-3d96-1ac9-3e45ca9c1989@hartkopp.net> In-Reply-To: <9ad203ae-9a50-3d96-1ac9-3e45ca9c1989@hartkopp.net> --jatEB1sZkAVzPFLV1EmwwPFoVIm76xQ0l Content-Type: text/plain; charset=utf-8 Content-Language: de-DE Content-Transfer-Encoding: quoted-printable On 10/18/20 10:46 AM, Oliver Hartkopp wrote: > Oh, answering myself ... >=20 > On 17.10.20 21:13, Oliver Hartkopp wrote: >> >> >> On 16.10.20 21:36, Marc Kleine-Budde wrote: >>> On 2/14/20 1:09 PM, Oleksij Rempel wrote: >>>> Hi all, >>>> >>>> any comments on this patch? >>> >>> I'm going to take this patch now for 5.10....Comments? >> >> Yes. >> >> Removing the sk reference will lead to the effect, that you will recei= ve=20 >> the CAN frames you have sent on that socket - which is disabled by def= ault: >> >> https://elixir.bootlin.com/linux/latest/source/net/can/raw.c#L124 >> >> See concept here: >> >> https://elixir.bootlin.com/linux/latest/source/Documentation/networkin= g/can.rst#L560=20 >> >> >> How can we maintain the CAN_RAW_RECV_OWN_MSGS to be disabled by defaul= t=20 >> and fix the described problem? >=20 >>>>> +=C2=A0=C2=A0=C2=A0 nskb =3D skb_clone(skb, GFP_ATOMIC); >>>>> +=C2=A0=C2=A0=C2=A0 if (unlikely(!nskb)) { >>>>> +=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 kfree_skb(skb); >>>>> +=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 return NULL; >>>>> =C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 } >>>>> -=C2=A0=C2=A0=C2=A0 /* we can assume to have an unshared skb with p= roper owner */ >>>>> -=C2=A0=C2=A0=C2=A0 return skb; >>>>> +=C2=A0=C2=A0=C2=A0 can_skb_set_owner(nskb, skb->sk); >=20 > skb-> sk is still set here - so everything should be fine. >=20 > Sorry for the noise. Is this a Acked-by/Reviewed-by? regrards, Marc --=20 Pengutronix e.K. | Marc Kleine-Budde | Embedded Linux | https://www.pengutronix.de | Vertretung West/Dortmund | Phone: +49-231-2826-924 | Amtsgericht Hildesheim, HRA 2686 | Fax: +49-5121-206917-5555 | --jatEB1sZkAVzPFLV1EmwwPFoVIm76xQ0l-- --tmTWZElo08yWeQ31SenvOyzr931fUdJRw Content-Type: application/pgp-signature; name="signature.asc" Content-Description: OpenPGP digital signature Content-Disposition: attachment; filename="signature.asc" -----BEGIN PGP SIGNATURE----- iQEzBAEBCgAdFiEEK3kIWJt9yTYMP3ehqclaivrt76kFAl+NMgAACgkQqclaivrt 76mepAgArN+OsCN+JuBLIW9cCJL1iMQEl2zKEtBTvwPL/RbHzeoRf9GX2NC0dYaD 6gtjWGoD36TjqTg7OJpQ3eIBaqlFtqvY/etKLayythxelN4IOpIpYo6pLe3X5reL 0MRAGbqZ2TIw6n5tVKAj4YQqx+yAx2VzYoyyVwI4Hid1en+IlHpY8uu7tdHLJQa4 5dH5wslxnjsSdKsO9BTYnehp/5SiJtHjBtgWpeSEGRZdFtFISsnDg3it6Askll6p fo4kL6pGjDFtC9Cmt+DMT44Zubgr+NQmMqJeqyl8hUw3CcpBIQbcSXK/PXofKt5V GZ15qGy1qX8z9xUErWg9DB/wz2pzjQ== =f0nO -----END PGP SIGNATURE----- --tmTWZElo08yWeQ31SenvOyzr931fUdJRw--