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Fri, 26 Apr 2024 12:43:35 +0000 (UTC) Received: from dovecot-director2.suse.de ([10.150.64.162]) by imap1.dmz-prg2.suse.org with ESMTPSA id BKtNOHehK2ZkVgAAD6G6ig (envelope-from ); Fri, 26 Apr 2024 12:43:35 +0000 Date: Fri, 26 Apr 2024 14:43:46 +0200 Message-ID: <877cgks399.wl-tiwai@suse.de> From: Takashi Iwai To: Rajashekar kuruva Cc: , , , , , , , , , , , , , , , , , , , , , Subject: Re: [PATCH] [RFC PATCH] ALSA: usb-audio: endpoint: Prevent NULL pointer deference in snd_usb_endpoint_close In-Reply-To: <20240426122511.547755-1-quic_kuruva@quicinc.com> References: <20240426122511.547755-1-quic_kuruva@quicinc.com> User-Agent: Wanderlust/2.15.9 (Almost Unreal) Emacs/27.2 Mule/6.0 Precedence: bulk X-Mailing-List: linux-usb@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 (generated by SEMI-EPG 1.14.7 - "Harue") Content-Type: text/plain; charset=US-ASCII X-Spam-Flag: NO X-Spam-Score: -0.63 X-Spam-Level: X-Spamd-Result: default: False [-0.63 / 50.00]; BAYES_HAM(-1.83)[93.99%]; SUSPICIOUS_RECIPS(1.50)[]; MID_CONTAINS_FROM(1.00)[]; NEURAL_HAM_LONG(-1.00)[-1.000]; NEURAL_HAM_SHORT(-0.20)[-1.000]; MIME_GOOD(-0.10)[text/plain]; RCVD_VIA_SMTP_AUTH(0.00)[]; RCVD_TLS_ALL(0.00)[]; MIME_TRACE(0.00)[0:+]; ARC_NA(0.00)[]; TAGGED_RCPT(0.00)[dt]; FREEMAIL_ENVRCPT(0.00)[gmail.com]; DKIM_SIGNED(0.00)[suse.de:s=susede2_rsa,suse.de:s=susede2_ed25519]; FROM_HAS_DN(0.00)[]; FREEMAIL_CC(0.00)[linaro.org,intel.com,perex.cz,kernel.org,lwn.net,gmail.com,linuxfoundation.org,synopsys.com,quicinc.com,suse.com,vger.kernel.org,alsa-project.org]; RCPT_COUNT_TWELVE(0.00)[23]; FROM_EQ_ENVFROM(0.00)[]; RCVD_COUNT_TWO(0.00)[2]; TO_MATCH_ENVRCPT_ALL(0.00)[]; FUZZY_BLOCKED(0.00)[rspamd.com]; TO_DN_SOME(0.00)[] On Fri, 26 Apr 2024 14:25:11 +0200, Rajashekar kuruva wrote: > > When multiple plug-in and plug-out events occur, > there is a risk of encountering a NULL pointer dereference > leading to a kernel panic during a headset use-case. > this issue arises in the snd_usb_endpoint_close function Such a scenario can't happen: ep->iface_ref is changed only in chip->mutex lock, hence it can't be NULL there. thanks, Takashi