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none DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=suse.com; s=susede1; t=1741276465; h=from:from:reply-to:date:date:message-id:message-id:to:to:cc:cc: mime-version:mime-version: content-transfer-encoding:content-transfer-encoding; bh=mTaHPsRRZCOiGdkTNUlAF5ltZ53FofM6pZK2QJOi+YU=; b=lknokf5AOD2/EnJ/h9cVNMLaHtyXttCECPwLOhG0shrjICDeciJQDRUfMfmBBk49QNFP2V ukEXyq+q6ssrsFP+bCxJpOyAnWLKDXJDwKK+LMlN1C4eyhkpl2I5gZwt6ISfLRu6NvMAOn mhbrTB0ODQHjGdm0OYCNrBGweO0Ilys= From: Juergen Gross To: xen-devel@lists.xenproject.org Cc: Juergen Gross , Andrew Cooper , Anthony PERARD , Michal Orzel , Jan Beulich , Julien Grall , =?UTF-8?q?Roger=20Pau=20Monn=C3=A9?= , Stefano Stabellini Subject: [PATCH] xen/events: fix get_global_virq_handler() usage without hardware domain Date: Thu, 6 Mar 2025 16:54:23 +0100 Message-ID: <20250306155423.3168-1-jgross@suse.com> X-Mailer: git-send-email 2.43.0 MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable X-Spam-Level: X-Spamd-Result: default: False [-2.80 / 50.00]; BAYES_HAM(-3.00)[99.99%]; MID_CONTAINS_FROM(1.00)[]; NEURAL_HAM_LONG(-1.00)[-1.000]; R_MISSING_CHARSET(0.50)[]; NEURAL_HAM_SHORT(-0.20)[-1.000]; MIME_GOOD(-0.10)[text/plain]; RCPT_COUNT_SEVEN(0.00)[9]; RCVD_VIA_SMTP_AUTH(0.00)[]; MIME_TRACE(0.00)[0:+]; ARC_NA(0.00)[]; DKIM_SIGNED(0.00)[suse.com:s=susede1]; FUZZY_BLOCKED(0.00)[rspamd.com]; FROM_EQ_ENVFROM(0.00)[]; FROM_HAS_DN(0.00)[]; TO_DN_SOME(0.00)[]; RCVD_COUNT_TWO(0.00)[2]; TO_MATCH_ENVRCPT_ALL(0.00)[]; DBL_BLOCKED_OPENRESOLVER(0.00)[suse.com:email,suse.com:mid]; RCVD_TLS_ALL(0.00)[] X-Spam-Score: -2.80 X-Spam-Flag: NO X-ZohoMail-DKIM: pass (identity @suse.com) (identity @suse.com) X-ZM-MESSAGEID: 1741276499951019000 Content-Type: text/plain; charset="utf-8" Some use cases of get_global_virq_handler() didn't account for the case of running without hardware domain. Fix that by testing get_global_virq_handler() returning NULL where needed (e.g. when directly dereferencing the result). Fixes: 980822c5edd1 ("xen/events: allow setting of global virq handler only= for unbound virqs") Signed-off-by: Juergen Gross --- xen/common/event_channel.c | 6 ++++-- 1 file changed, 4 insertions(+), 2 deletions(-) diff --git a/xen/common/event_channel.c b/xen/common/event_channel.c index 4ee6b6b4ce..fa83d9dd1a 100644 --- a/xen/common/event_channel.c +++ b/xen/common/event_channel.c @@ -1036,7 +1036,9 @@ int set_global_virq_handler(struct domain *d, uint32_= t virq) { old =3D global_virq_handlers[virq]; hdl =3D get_global_virq_handler(virq); - if ( hdl !=3D d ) + if ( !hdl ) + global_virq_handlers[virq] =3D d; + else if ( hdl !=3D d ) { read_lock(&hdl->event_lock); =20 @@ -1091,7 +1093,7 @@ struct domain *lock_dom_exc_handler(void) struct domain *d; =20 d =3D get_global_virq_handler(VIRQ_DOM_EXC); - if ( unlikely(!get_domain(d)) ) + if ( unlikely(!d || !get_domain(d)) ) return NULL; =20 read_lock(&d->event_lock); --=20 2.43.0