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Wed, 01 Jan 2020 19:18:58 +0100 Date: Wed, 1 Jan 2020 19:18:57 +0100 From: Jonathan =?utf-8?Q?Neusch=C3=A4fer?= To: Brian Masney Subject: Re: [PATCH] iommu/qcom: fix NULL pointer dereference during probe deferral Message-ID: <20200101181857.GB2110@latitude> References: <20200101033949.755-1-masneyb@onstation.org> MIME-Version: 1.0 In-Reply-To: <20200101033949.755-1-masneyb@onstation.org> User-Agent: Mutt/1.10.1 (2018-07-13) X-Provags-ID: V03:K1:3eYn0RZGHqV1q9jear8kWLgBqk7G/K4ETwM30zDRTCkJUqY6pCy K48FKiO3NN3BtpX31To/OcNCQiU4cs6fWV0iKVceLlc5KnL+I8mr+i4/i4F+M/xeEz97yn/ UA4SezqipJ1XKPN8AV1V8ywBoC66lYeT0Jm636FhQuDnxsNTe3RlNNabqbUbyA7XpuZo7tP aJGtkbsuWqLjlmP//fE0g== X-UI-Out-Filterresults: notjunk:1;V03:K0:iLkOSE/y0FE=:1U22ENNWgayFiSrwSh3M37 crbHF62WoA5m10xSN6vB76UxhTot4SEQDASsoFjnvMNUPvQcqmFQc3iNydauQTWZolUv+61k7 Qkt519I4MnfNNFu0k/J6Drc28aSjyWqBijaWPueID4n6f/coz0erbEKVoHDHUB7quOJUynuSv /sIkoJ0MH1poV2JAXjy45ievAPC5tZv+TNtlo4NcPrL2KC7GXi3EI39tvra3Gx9I2NUCYHYwn CcBKp0es90e1F6wYYod2sz14wcIGg3X3MHCkj2vDTJfx2B90612PZqoGFqD3p1DeJ3LmB5ZVQ xK0iXXBtNMzPM/TAWwiEeLY90kOGQcRuoRG3qGo/NZ1cxHPbNrf/K0das2vaJA94mvdyO1mVK DP0YgnQ6hoa4AYrmkUL9sWZuqtIpLbgC3dnMAsusKRnLH1Pue0/XxONNxiMisujb9AVRS9Vva +t0rY24oM4H0slQ0/1YzCv80OoGVJAVRb6cIjscIYbwtvx5xLg3zVaBl520CpY36pKauJ82Gx kQm4hIvCC1SUo+bz9M/EeqmT2SBcFoHVnQHqtFIV+H+Vh2s8bHpCkAevZVA/0CjIMSUB7LZkd ggavJNDaYIsvWVJYB75qf11qS71TyvqfMtLTyr1z16ihOkttdHeAMUkpd/SRg+oC+rPamSz/g I5UoEu3dw23UUHecV7rJeA77mBY4JBCYRefUTyvXyMdh0aff2N4XJw3OyQoNntJmyTx9nNmkr yTiKoXPuXPpcvS0dvTr1C6IESXlOSBKBx2SLsBFoHOvkd4NPtf1DkvVnPEGjlXQNQlUOPDwvi pS1oUVq4XIC++LKAMT269jBcXAV7/VZfIG3AHAAZLZ5ylEM59KD7p57//KOh1lhRls3//qljg /wOoXBTGqRvxKuU/LZ7OxgB/XLitYCHNp1xk2FCy1eplMh6t/UFXCAnGKe5yogAFUrBn5wSzF RRF4Ht+HY3zAa5nEWZK2LJ0RHA3YCSR0bxrghhuI2kYRdYhylGSZhXgQbmMVRsSiINkYSY84e MGhfCAT702ntQ85u/+7dV37wPI84n2KK4Fkq7C4GugmWZ9gf/i6Edl1tRzUfegceDfUJ6le4E cWM2PlD570jRpGSTdSjQ3xk2P+BhfJpx8hCZeGCVF+5bb2G+BRwv7UP/W5BFmUzvv/HXb1yFQ nQssxjlfnkCkOfN+qzhIdsfKtpQkw3GfmZPw3a1JzMoa/e89fl9/DXykHeScGxqnXIp2tXrcx BLNsZroG7655XoznHBk6I5pMt0mwo0CR5XYA+DwRHLhOfoDmicK9c1UKyNhM= Cc: linux-arm-msm@vger.kernel.org, iommu@lists.linux-foundation.org, bjorn.andersson@linaro.org, agross@kernel.org, linux-kernel@vger.kernel.org X-BeenThere: iommu@lists.linux-foundation.org X-Mailman-Version: 2.1.15 Precedence: list List-Id: Development issues for Linux IOMMU support List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Content-Type: multipart/mixed; boundary="===============8116746159726283183==" Errors-To: iommu-bounces@lists.linux-foundation.org Sender: "iommu" --===============8116746159726283183== Content-Type: multipart/signed; micalg=pgp-sha512; protocol="application/pgp-signature"; boundary="mP3DRpeJDSE+ciuQ" Content-Disposition: inline --mP3DRpeJDSE+ciuQ Content-Type: text/plain; charset=utf-8 Content-Disposition: inline Content-Transfer-Encoding: quoted-printable On Tue, Dec 31, 2019 at 10:39:49PM -0500, Brian Masney wrote: [...] > (kernel_init) from ret_from_fork (arch/arm/kernel/entry-common.S:156) > Exception stack(0xee89dfb0 to 0xee89dff8) > dfa0: 00000000 00000000 00000000 = 00000000 > dfc0: 00000000 00000000 00000000 00000000 00000000 00000000 00000000 = 00000000 > dfe0: 00000000 00000000 00000000 00000000 00000013 00000000 > Code: e92d4070 e1a04000 e3a01004 e240501c (e5930014) This looks like ARM code... > All code > =3D=3D=3D=3D=3D=3D=3D=3D > 0: 70 40 jo 0x42 > 2: 2d e9 00 40 a0 sub $0xa04000e9,%eax > 7: e1 04 loope 0xd > 9: 10 a0 e3 1c 50 40 adc %ah,0x40501ce3(%rax) > f: e2 14 loop 0x25 > 11:* 00 .byte 0x0 <-- trapping instruction > 12: 93 xchg %eax,%ebx > 13: e5 .byte 0xe5 =2E.. disassembled as x86 code. I suspect that scripts/decodecode picked up the wrong architecture somehow. Perhaps CROSS_COMPILE wasn't set? >=20 > Code starting with the faulting instruction > =3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D= =3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D > 0: 14 00 adc $0x0,%al > 2: 93 xchg %eax,%ebx > 3: e5 .byte 0xe5 Greetings and a happy new year, Jonathan Neusch=C3=A4fer --mP3DRpeJDSE+ciuQ Content-Type: application/pgp-signature; name="signature.asc" -----BEGIN PGP SIGNATURE----- iQIzBAABCgAdFiEEvHAHGBBjQPVy+qvDCDBEmo7zX9sFAl4M4ogACgkQCDBEmo7z X9uc6xAAt8EnWXrDJbKJksr2JLYDwsRONNkcbseMDFX6lxbaUtMInIzz+lALKI23 VFFFwmNKK72kxiQYgITNFWV4LC19MBMKdXSXtw8F56MX1vIFgcibvh703Y0n/hEE 81tMDn3DVlDyuRMN+jTAZrFMqeFB2yywoPYjzesQX9hprI0DyyGZtPbqRHkCpWfN aWthJYvX1+QWyMjt8fHinUsLptLA7qtb4ZRUMXg/O8xO+NC3Khn9nVc8wqDeddAH A/U9i9bvhFBzQotNQdqaxzn/4mlBGN9xpPR+b2m6evJ+71Di1uNpoZocxrIdEMsv NPor1p04QFW8nWL1ZT6qa8MyUPuv+YTRrqBYnaXgPskBMal/KA+0U98WOWzWh84u IKxWLYD1O3SL0udQsIXOb6FUE4fSrzXDKIWtgZERhnqM2vrmGooJbRNyE/IeRdXD Q8gkOLwxZKX7aRzzXqYVCWbQsBIvE3oUUtJB/kdleY0Q1CRb9l2tYTqrlnMcSjIE Qxh9EZim7MgzwX8nmf4CSAV5t7gSSoxlLXiMZOAye2AkhHygdVlGEH0AQk4P17oW P6jwyKZ/88PgNai3frPAYOufE+AHS49K/p7iOWcmPbSmyJ3ii6tml6h8kvWA0ff1 sHXQgCiyZPUKNg3KD5TOZ4rLQwxon85eYlqP+KbB3taO1H6Mwvo= =xMEO -----END PGP SIGNATURE----- --mP3DRpeJDSE+ciuQ-- --===============8116746159726283183== Content-Type: text/plain; charset="us-ascii" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit Content-Disposition: inline _______________________________________________ iommu mailing list iommu@lists.linux-foundation.org https://lists.linuxfoundation.org/mailman/listinfo/iommu --===============8116746159726283183==--