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Miller" , Jarkko Sakkinen , Andrew Zaborowski CC: Roman Smirnov , , , , , Sergey Shtylyov , Karina Yankevich , Sergey Yudin Subject: [PATCH v3] KEYS: prevent NULL pointer dereference in find_asymmetric_key() Date: Fri, 13 Sep 2024 17:30:09 +0300 Message-ID: <20240913143010.117883-1-r.smirnov@omp.ru> X-Mailer: git-send-email 2.43.0 Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable X-ClientProxiedBy: msexch01.omp.ru (10.188.4.12) To msexch01.omp.ru (10.188.4.12) X-KSE-ServerInfo: msexch01.omp.ru, 9 X-KSE-AntiSpam-Interceptor-Info: scan successful X-KSE-AntiSpam-Version: 6.1.1, Database issued on: 09/13/2024 14:17:55 X-KSE-AntiSpam-Status: KAS_STATUS_NOT_DETECTED X-KSE-AntiSpam-Method: none X-KSE-AntiSpam-Rate: 59 X-KSE-AntiSpam-Info: Lua profiles 187737 [Sep 13 2024] X-KSE-AntiSpam-Info: Version: 6.1.1.5 X-KSE-AntiSpam-Info: Envelope from: r.smirnov@omp.ru X-KSE-AntiSpam-Info: LuaCore: 34 0.3.34 8a1fac695d5606478feba790382a59668a4f0039 X-KSE-AntiSpam-Info: {rep_avail} X-KSE-AntiSpam-Info: {Tracking_from_domain_doesnt_match_to} X-KSE-AntiSpam-Info: {relay has no DNS name} X-KSE-AntiSpam-Info: {SMTP from is not routable} X-KSE-AntiSpam-Info: {Found in DNSBL: 178.205.55.120 in (user) b.barracudacentral.org} X-KSE-AntiSpam-Info: {Found in DNSBL: 178.205.55.120 in (user) dbl.spamhaus.org} X-KSE-AntiSpam-Info: d41d8cd98f00b204e9800998ecf8427e.com:7.1.1;127.0.0.199:7.1.2;omp.ru:7.1.1 X-KSE-AntiSpam-Info: FromAlignment: s X-KSE-AntiSpam-Info: ApMailHostAddress: 178.205.55.120 X-KSE-AntiSpam-Info: {DNS response errors} X-KSE-AntiSpam-Info: Rate: 59 X-KSE-AntiSpam-Info: Status: not_detected X-KSE-AntiSpam-Info: Method: none X-KSE-AntiSpam-Info: Auth:dmarc=temperror header.from=omp.ru;spf=temperror smtp.mailfrom=omp.ru;dkim=none X-KSE-Antiphishing-Info: Clean X-KSE-Antiphishing-ScanningType: Heuristic X-KSE-Antiphishing-Method: None X-KSE-Antiphishing-Bases: 09/13/2024 14:22:00 X-KSE-Antivirus-Interceptor-Info: scan successful X-KSE-Antivirus-Info: Clean, bases: 9/13/2024 12:44:00 PM X-KSE-Attachment-Filter-Triggered-Rules: Clean X-KSE-Attachment-Filter-Triggered-Filters: Clean X-KSE-BulkMessagesFiltering-Scan-Result: InTheLimit Content-Type: text/plain; charset="utf-8" In find_asymmetric_key(), if all NULLs are passed in the id_{0,1,2} arguments, the kernel will first emit WARN but then have an oops because id_2 gets dereferenced anyway. Add the missing id_2 check and move WARN_ON() to the final else branch to avoid duplicate NULL checks. Found by Linux Verification Center (linuxtesting.org) with Svace static analysis tool. Fixes: 7d30198ee24f ("keys: X.509 public key issuer lookup without AKID") Suggested-by: Sergey Shtylyov Signed-off-by: Roman Smirnov Reviewed-by: Sergey Shtylyov --- V1 -> V2: updated patch description, returned WARN_ON() macro V2 -> V3: updated patch description crypto/asymmetric_keys/asymmetric_type.c | 7 ++++--- 1 file changed, 4 insertions(+), 3 deletions(-) diff --git a/crypto/asymmetric_keys/asymmetric_type.c b/crypto/asymmetric_k= eys/asymmetric_type.c index a5da8ccd353e..43af5fa510c0 100644 --- a/crypto/asymmetric_keys/asymmetric_type.c +++ b/crypto/asymmetric_keys/asymmetric_type.c @@ -60,17 +60,18 @@ struct key *find_asymmetric_key(struct key *keyring, char *req, *p; int len; =20 - WARN_ON(!id_0 && !id_1 && !id_2); - if (id_0) { lookup =3D id_0->data; len =3D id_0->len; } else if (id_1) { lookup =3D id_1->data; len =3D id_1->len; - } else { + } else if (id_2) { lookup =3D id_2->data; len =3D id_2->len; + } else { + WARN_ON(1); + return ERR_PTR(-EINVAL); } =20 /* Construct an identifier "id:". */ --=20 2.43.0