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Thu, 11 Sep 2025 17:02:35 +0000 (UTC) Received: from dovecot-director2.suse.de ([2a07:de40:b281:106:10:150:64:167]) by imap1.dmz-prg2.suse.org with ESMTPSA id wGJtBqsAw2gUJAAAD6G6ig (envelope-from ); Thu, 11 Sep 2025 17:02:35 +0000 From: Vlastimil Babka Date: Thu, 11 Sep 2025 19:02:37 +0200 Subject: [PATCH 4/6] slab: move validate_slab_ptr() from alloc_consistency_checks() to its caller Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: quoted-printable Message-Id: <20250911-slub-slab-validation-v1-4-8b67eb3b3dc5@suse.cz> References: <20250911-slub-slab-validation-v1-0-8b67eb3b3dc5@suse.cz> In-Reply-To: <20250911-slub-slab-validation-v1-0-8b67eb3b3dc5@suse.cz> To: "Matthew Wilcox (Oracle)" Cc: Harry Yoo , Christoph Lameter , David Rientjes , Roman Gushchin , Andrew Morton , linux-mm@kvack.org, linux-kernel@vger.kernel.org, Vlastimil Babka X-Mailer: b4 0.14.2 X-Spamd-Result: default: False [-4.30 / 50.00]; BAYES_HAM(-3.00)[100.00%]; NEURAL_HAM_LONG(-1.00)[-1.000]; NEURAL_HAM_SHORT(-0.20)[-0.997]; MIME_GOOD(-0.10)[text/plain]; RCVD_VIA_SMTP_AUTH(0.00)[]; ARC_NA(0.00)[]; RCVD_TLS_ALL(0.00)[]; MIME_TRACE(0.00)[0:+]; FUZZY_RATELIMITED(0.00)[rspamd.com]; TO_DN_SOME(0.00)[]; RCPT_COUNT_SEVEN(0.00)[9]; MID_RHS_MATCH_FROM(0.00)[]; DKIM_SIGNED(0.00)[suse.cz:s=susede2_rsa,suse.cz:s=susede2_ed25519]; FROM_HAS_DN(0.00)[]; R_RATELIMIT(0.00)[to_ip_from(RLwn5r54y1cp81no5tmbbew5oc)]; FROM_EQ_ENVFROM(0.00)[]; TO_MATCH_ENVRCPT_ALL(0.00)[]; RCVD_COUNT_TWO(0.00)[2]; DBL_BLOCKED_OPENRESOLVER(0.00)[suse.cz:mid,suse.cz:email] X-Spam-Flag: NO X-Spam-Level: X-Spam-Score: -4.30 In alloc_debug_processing() we can call validate_slab_ptr() upfront and then don't need to recheck when alloc_consistency_checks() fails for other reasons. Signed-off-by: Vlastimil Babka Reviewed-by: Harry Yoo --- mm/slub.c | 30 ++++++++++++++---------------- 1 file changed, 14 insertions(+), 16 deletions(-) diff --git a/mm/slub.c b/mm/slub.c index 94a089205a86f0667444484e158d307e72cd96e1..909c71372a2f542b6e0d67c12ea= 683133b246b66 100644 --- a/mm/slub.c +++ b/mm/slub.c @@ -1633,11 +1633,6 @@ void setup_slab_debug(struct kmem_cache *s, struct s= lab *slab, void *addr) static inline int alloc_consistency_checks(struct kmem_cache *s, struct slab *slab, void *object) { - if (!validate_slab_ptr(slab)) { - slab_err(s, slab, "Not a valid slab page"); - return 0; - } - if (!check_slab(s, slab)) return 0; =20 @@ -1656,6 +1651,11 @@ static noinline bool alloc_debug_processing(struct k= mem_cache *s, struct slab *slab, void *object, int orig_size) { if (s->flags & SLAB_CONSISTENCY_CHECKS) { + if (!validate_slab_ptr(slab)) { + slab_err(s, slab, "Not a valid slab page"); + return false; + } + if (!alloc_consistency_checks(s, slab, object)) goto bad; } @@ -1667,17 +1667,15 @@ static noinline bool alloc_debug_processing(struct = kmem_cache *s, return true; =20 bad: - if (validate_slab_ptr(slab)) { - /* - * If this is a slab page then lets do the best we can - * to avoid issues in the future. Marking all objects - * as used avoids touching the remaining objects. - */ - slab_fix(s, "Marking all objects used"); - slab->inuse =3D slab->objects; - slab->freelist =3D NULL; - slab->frozen =3D 1; /* mark consistency-failed slab as frozen */ - } + /* + * Let's do the best we can to avoid issues in the future. Marking all + * objects as used avoids touching the remaining objects. + */ + slab_fix(s, "Marking all objects used"); + slab->inuse =3D slab->objects; + slab->freelist =3D NULL; + slab->frozen =3D 1; /* mark consistency-failed slab as frozen */ + return false; } =20 --=20 2.51.0