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Tue, 06 Jun 2023 16:14:25 -0700 (PDT) From: William Zhang To: Broadcom Kernel List , Linux MTD List Cc: f.fainelli@gmail.com, rafal@milecki.pl, kursad.oney@broadcom.com, joel.peshkin@broadcom.com, computersforpeace@gmail.com, anand.gore@broadcom.com, dregan@mail.com, kamal.dasu@broadcom.com, tomer.yacoby@broadcom.com, dan.beygelman@broadcom.com, William Zhang , Florian Fainelli , Miquel Raynal , linux-kernel@vger.kernel.org, Vignesh Raghavendra , Richard Weinberger , Kamal Dasu Subject: [PATCH 04/12] mtd: rawnand: brcmnand: Fix potential out-of-bounds access in oob write Date: Tue, 6 Jun 2023 16:12:44 -0700 Message-Id: <20230606231252.94838-5-william.zhang@broadcom.com> X-Mailer: git-send-email 2.34.1 In-Reply-To: <20230606231252.94838-1-william.zhang@broadcom.com> References: <20230606231252.94838-1-william.zhang@broadcom.com> MIME-Version: 1.0 X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20230606_161427_495939_4A088929 X-CRM114-Status: GOOD ( 12.49 ) X-BeenThere: linux-mtd@lists.infradead.org X-Mailman-Version: 2.1.34 Precedence: list List-Id: Linux MTD discussion mailing list List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Content-Type: multipart/mixed; boundary="===============1002989512010877122==" Sender: "linux-mtd" Errors-To: linux-mtd-bounces+linux-mtd=archiver.kernel.org@lists.infradead.org --===============1002989512010877122== Content-Type: multipart/signed; protocol="application/pkcs7-signature"; micalg=sha-256; boundary="0000000000003917ff05fd7e2e39" --0000000000003917ff05fd7e2e39 Content-Transfer-Encoding: 8bit When the oob buffer length is not in multiple of words, the oob write function does out-of-bounds read on the oob source buffer at the last iteration. Fix that by always checking length limit on the oob buffer read and fill with 0xff when reaching the end of the buffer to the oob registers. Fixes: 27c5b17cd1b1 ("mtd: nand: add NAND driver "library" for Broadcom STB NAND controller") Signed-off-by: William Zhang Reviewed-by: Florian Fainelli --- drivers/mtd/nand/raw/brcmnand/brcmnand.c | 8 ++++---- 1 file changed, 4 insertions(+), 4 deletions(-) diff --git a/drivers/mtd/nand/raw/brcmnand/brcmnand.c b/drivers/mtd/nand/raw/brcmnand/brcmnand.c index 20832857c4aa..d920e88c7f5b 100644 --- a/drivers/mtd/nand/raw/brcmnand/brcmnand.c +++ b/drivers/mtd/nand/raw/brcmnand/brcmnand.c @@ -1486,10 +1486,10 @@ static int write_oob_to_regs(struct brcmnand_controller *ctrl, int i, for (j = 0; j < tbytes; j += 4) oob_reg_write(ctrl, j, - (oob[j + 0] << 24) | - (oob[j + 1] << 16) | - (oob[j + 2] << 8) | - (oob[j + 3] << 0)); + (((j < tbytes) ? oob[j] : 0xff) << 24) | + (((j + 1 < tbytes) ? oob[j + 1] : 0xff) << 16) | + (((j + 2 < tbytes) ? oob[j + 2] : 0xff) << 8) | + ((j + 3 < tbytes) ? oob[j + 3] : 0xff)); return tbytes; } -- 2.37.3 --0000000000003917ff05fd7e2e39 Content-Type: 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