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b=BhDRRFxRwwd11ASjYIs0cD4xfWvo6C0Pp1iujVn9gSI722b/vyZnzyMrzRO4/WR93 0Cnh+bPtiCPmnLKFKOceeRvoqV3rWScHErgvlsw5c3E3DFYQhsYJJuTjlBgALbaC6Q FKqHrafLb9Fy8I3LQxauJl7IMUlnwRlLmDYx9QaM= Received: from pek-lxu-l1.wrs.com ([111.198.228.153]) by newxmesmtplogicsvrszc6-0.qq.com (NewEsmtp) with SMTP id EA69D298; Sun, 14 Apr 2024 20:58:38 +0800 X-QQ-mid: xmsmtpt1713099518tqpcya88w Message-ID: X-QQ-XMAILINFO: NSTsyPg8kQQYPafq0PxPC8aD8BvsfSvExymQI6nfTgUQ3m5giO63IXER+Zudqw 6QUTyIHSks2UgWx4pEvYwykZzHGkKnoVVjWY/Mk8ZY6r+o71UtEbrI/+amyMoGUw94+ARuvwbAFH pdNU6vtNz9G0OyZFY9jtE27MqDt/+9B+R00dGIEfOLiFLIbBQETqMBC3bqF/Zh3naRzmkHOt17qj ik53NfVlekj8VugvAx5k8nPKTVF9eZl0Ue4fPAO1I/hp/XRupEOT7TJFBk1bB+WM69WsYUsb6BtJ zBcXUnMS0gWLNsWatjjx6+ujNdLEnfpBY9mD27z9RNlnZdoM+2ySQNVx85GO4Wd6RYRQeKryz/og JvaEcOcO3EYK+pcGJhKBOnxSZyia9VZIN7oy9HsMF6ogvEqCbwmTjiRC/c7TblzqSkvzLZYXBRY8 wdjgJmGFz8u8t7+ETS6kn9ch0EeEoWz6LD+adEIBV6xoq6MlW5WiACVtE0ru4Fr5WAV9jh9ACSbL eTUOFCiCNbyFXW+qtzqH14OnSchxxoy9fmOEgATh+QidJ6FD8Mw+rns2b2Xtpakwv3W5D3lmWq05 qHjQA8Y0DCYxXnYHCq5ZscgfTSxNieG58Ihh3FGZLCEGle+BAxblyLXb4KoYVPdHUIax0DrJSzQk 2h/qCcQkSkqhCsCqNATcxABpebOzH4M6UUa1H++voLBdiaugcOcCQ7/V7j7vnaFyAn82rZ4Il9Xl w3p5hPXPT5IVD5rL67/NJZNJVKsVgIHbC7N2y3WvMN39qCzBACr4C/7LeTSGaGkxbsQUyZdXFGWr 0hsMOwzs725RY9HpXus2yVvlXNrhTvW7vWKprvd+dciAb7A3TXSDJ1jOCVAHrCPcgR1ugEgyk8Mn s1FQx15024CJCw3Q+flAr+jnNweED+j2QpwJTYSkQjYSkSR5Fy3rAtuw/nbxl1x9UrCKpnToTHEM Z27EUtPgY= X-QQ-XMRINFO: NI4Ajvh11aEj8Xl/2s1/T8w= From: Edward Adam Davis To: syzbot+d0f14b2d5a3d1587fbe7@syzkaller.appspotmail.com Cc: linux-kernel@vger.kernel.org, syzkaller-bugs@googlegroups.com Subject: Re: [syzbot] [pvrusb2?] KASAN: slab-use-after-free Read in pvr2_context_set_notify (2) Date: Sun, 14 Apr 2024 20:58:39 +0800 X-OQ-MSGID: <20240414125838.3707504-2-eadavis@qq.com> X-Mailer: git-send-email 2.43.0 In-Reply-To: <000000000000bb465d061606e827@google.com> References: <000000000000bb465d061606e827@google.com> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit please test uaf in pvr2_context_set_notify #syz test https://git.kernel.org/pub/scm/linux/kernel/git/gregkh/usb.git a788e53c05ae diff --git a/drivers/media/usb/pvrusb2/pvrusb2-context.c b/drivers/media/usb/pvrusb2/pvrusb2-context.c index 1764674de98b..e93bca93ce4c 100644 --- a/drivers/media/usb/pvrusb2/pvrusb2-context.c +++ b/drivers/media/usb/pvrusb2/pvrusb2-context.c @@ -267,9 +267,9 @@ static void pvr2_context_exit(struct pvr2_context *mp) void pvr2_context_disconnect(struct pvr2_context *mp) { pvr2_hdw_disconnect(mp->hdw); - mp->disconnect_flag = !0; if (!pvr2_context_shutok()) pvr2_context_notify(mp); + mp->disconnect_flag = !0; }