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Iglesias" , Peter Maydell , qemu-arm@nongnu.org, qemu-devel@nongnu.org, sdl.qemu@linuxtesting.org Subject: [PATCH RFC] prevent overflow in xlnx_dpdma_desc_get_source_address() Date: Fri, 12 Apr 2024 11:13:28 +0300 Message-Id: <20240412081328.11183-1-adiupina@astralinux.ru> X-Mailer: git-send-email 2.30.2 MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable X-DrWeb-SpamScore: -100 X-DrWeb-SpamState: legit X-DrWeb-SpamDetail: gggruggvucftvghtrhhoucdtuddrgedvfedrvdehuddgtddvucetufdoteggodetrfcurfhrohhfihhlvgemucfftfghgfeunecuuegrihhlohhuthemuceftddtnecusecvtfgvtghiphhivghnthhsucdlqddutddtmdenucfjughrpefhvfevufffkffoggfgsedtkeertdertddtnecuhfhrohhmpeetlhgvgigrnhgurhgrucffihhuphhinhgruceorgguihhuphhinhgrsegrshhtrhgrlhhinhhugidrrhhuqeenucggtffrrghtthgvrhhnpeduleetfeehffekueeuffektefgudfgffeutdefudfghedvieffheehleeuieehteenucffohhmrghinheplhhinhhugihtvghsthhinhhgrdhorhhgnecukfhppedutddrudejjedrvdefiedrvddvheenucfrrghrrghmpehhvghloheprhgsthgrqdhmshhkqdhlthdqfedtvdeiledtrdgrshhtrhgrlhhinhhugidrrhhupdhinhgvthepuddtrddujeejrddvfeeirddvvdehmeehheefiedvpdhmrghilhhfrhhomheprgguihhuphhinhgrsegrshhtrhgrlhhinhhugidrrhhupdhnsggprhgtphhtthhopeejpdhrtghpthhtoheprghlihhsthgrihhrsegrlhhishhtrghirhdvfedrmhgvpdhrtghpthhtoheprgguihhuphhinhgrsegrshhtrhgrlhhinhhugidrrhhupdhrtghpthhtohepvggughgrrhdrihhglhgvshhirghssehgmhgrihhlrdgtohhmpdhrtghpthhtohepphgvthgvrhdrmhgrhiguvghllheslhhinhgrrhhordhorhhgpdhrtghpthhtoh epqhgvmhhuqdgrrhhmsehnohhnghhnuhdrohhrghdprhgtphhtthhopehqvghmuhdquggvvhgvlhesnhhonhhgnhhurdhorhhgpdhrtghpthhtohepshgulhdrqhgvmhhusehlihhnuhigthgvshhtihhnghdrohhrgh X-DrWeb-SpamVersion: Vade Retro 01.423.251#02 AS+AV+AP Profile: DRWEB; Bailout: 300 X-AntiVirus: Checked by Dr.Web [MailD: 11.1.19.2307031128, SE: 11.1.12.2210241838, Core engine: 7.00.62.01180, Virus records: 12591016, Updated: 2024-Apr-12 06:38:41 UTC] Received-SPF: pass (zohomail.com: domain of gnu.org designates 209.51.188.17 as permitted sender) client-ip=209.51.188.17; envelope-from=qemu-devel-bounces+importer=patchew.org@nongnu.org; helo=lists.gnu.org; Received-SPF: pass client-ip=51.250.53.244; envelope-from=adiupina@astralinux.ru; helo=new-mail.astralinux.ru X-Spam_score_int: -18 X-Spam_score: -1.9 X-Spam_bar: - X-Spam_report: (-1.9 / 5.0 requ) BAYES_00=-1.9, SPF_HELO_NONE=0.001, SPF_PASS=-0.001 autolearn=ham autolearn_force=no X-Spam_action: no action X-BeenThere: qemu-devel@nongnu.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: qemu-devel-bounces+importer=patchew.org@nongnu.org Sender: qemu-devel-bounces+importer=patchew.org@nongnu.org X-ZM-MESSAGEID: 1712909678624100003 Content-Type: text/plain; charset="utf-8" Overflow can occur in a situation where desc->source_address has a maximum value (pow(2, 32) - 1), so add a cast to a larger type before the assignment. Found by Linux Verification Center (linuxtesting.org) with SVACE. Fixes: d3c6369a96 ("introduce xlnx-dpdma") Signed-off-by: Alexandra Diupina --- hw/dma/xlnx_dpdma.c | 20 ++++++++++---------- 1 file changed, 10 insertions(+), 10 deletions(-) diff --git a/hw/dma/xlnx_dpdma.c b/hw/dma/xlnx_dpdma.c index 1f5cd64ed1..224259225c 100644 --- a/hw/dma/xlnx_dpdma.c +++ b/hw/dma/xlnx_dpdma.c @@ -175,24 +175,24 @@ static uint64_t xlnx_dpdma_desc_get_source_address(DP= DMADescriptor *desc, =20 switch (frag) { case 0: - addr =3D desc->source_address - + (extract32(desc->address_extension, 16, 12) << 20); + addr =3D (uint64_t)(desc->source_address + + (extract32(desc->address_extension, 16, 12) << 20)); break; case 1: - addr =3D desc->source_address2 - + (extract32(desc->address_extension_23, 0, 12) << 8); + addr =3D (uint64_t)(desc->source_address2 + + (extract32(desc->address_extension_23, 0, 12) << 8)); break; case 2: - addr =3D desc->source_address3 - + (extract32(desc->address_extension_23, 16, 12) << 20); + addr =3D (uint64_t)(desc->source_address3 + + (extract32(desc->address_extension_23, 16, 12) << 20)); break; case 3: - addr =3D desc->source_address4 - + (extract32(desc->address_extension_45, 0, 12) << 8); + addr =3D (uint64_t)(desc->source_address4 + + (extract32(desc->address_extension_45, 0, 12) << 8)); break; case 4: - addr =3D desc->source_address5 - + (extract32(desc->address_extension_45, 16, 12) << 20); + addr =3D (uint64_t)(desc->source_address5 + + (extract32(desc->address_extension_45, 16, 12) << 20)); break; default: addr =3D 0; --=20 2.30.2