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Win64; x64; rv:102.0) Gecko/20100101 Thunderbird/102.11.2 Subject: Re: [PATCH v2] mtd: rawnand: meson: check buffer length To: Miquel Raynal Cc: Arseniy Krasnov , Richard Weinberger , Vignesh Raghavendra , Neil Armstrong , Kevin Hilman , Jerome Brunet , Martin Blumenstingl , oxffffaa@gmail.com, kernel@sberdevices.ru, linux-mtd@lists.infradead.org, linux-arm-kernel@lists.infradead.org, linux-amlogic@lists.infradead.org, linux-kernel@vger.kernel.org References: <20230606101644.3297859-1-AVKrasnov@sberdevices.ru> <9adef6da-5930-dcaa-f148-e4a398d39f2d@sberdevices.ru> <3a9470ed-d7ad-6cae-0d58-732399590272@sberdevices.ru> <7903580d-685c-14e6-5572-81a4cb31cced@amlogic.com> <20230608085458.449a24c0@xps-13> From: Liang Yang In-Reply-To: <20230608085458.449a24c0@xps-13> Content-Type: text/plain; charset=UTF-8; format=flowed Content-Transfer-Encoding: 8bit X-ClientProxiedBy: TYWP286CA0019.JPNP286.PROD.OUTLOOK.COM (2603:1096:400:262::6) To JH0PR03MB7495.apcprd03.prod.outlook.com (2603:1096:990:9::6) MIME-Version: 1.0 X-MS-PublicTrafficType: Email X-MS-TrafficTypeDiagnostic: JH0PR03MB7495:EE_|SI2PR03MB6806:EE_ X-MS-Office365-Filtering-Correlation-Id: b9819c12-b9f2-4950-73cc-08db67efbc04 X-MS-Exchange-SenderADCheck: 1 X-MS-Exchange-AntiSpam-Relay: 0 X-Microsoft-Antispam: BCL:0; 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Also check MTD write size on >>>>> chip attach. >>>>> >>>>> Signed-off-by: Arseniy Krasnov >>>>> --- >>>>> drivers/mtd/nand/raw/meson_nand.c | 47 +++++++++++++++++++++++++++---- >>>>> 1 file changed, 42 insertions(+), 5 deletions(-) >>>>> >>>>> diff --git a/drivers/mtd/nand/raw/meson_nand.c b/drivers/mtd/nand/raw/meson_nand.c >>>>> index 23a73268421b..db6b18753071 100644 >>>>> --- a/drivers/mtd/nand/raw/meson_nand.c >>>>> +++ b/drivers/mtd/nand/raw/meson_nand.c >>>>> @@ -111,6 +111,8 @@ >>>>> >>>>> #define PER_INFO_BYTE 8 >>>>> >>>>> +#define NFC_CMD_RAW_LEN GENMASK(13, 0) >>>>> + >>>>> struct meson_nfc_nand_chip { >>>>> struct list_head node; >>>>> struct nand_chip nand; >>>>> @@ -284,7 +286,7 @@ static void meson_nfc_cmd_access(struct nand_chip *nand, int raw, bool dir, >>>>> >>>>> if (raw) { >>>>> len = mtd->writesize + mtd->oobsize; >>>>> - cmd = (len & GENMASK(13, 0)) | scrambler | DMA_DIR(dir); >>>>> + cmd = len | scrambler | DMA_DIR(dir); >>>>> writel(cmd, nfc->reg_base + NFC_REG_CMD); >> >> I think we could keep "& GENMASK(13, 0)". it is better here to indicate how many bits of length in this command and don't destory the command once we don't check the "len" outside of this function. or the code "if (len > NFC_CMD_RAW_LEN)" is better to put inside this function nearly. Thanks. > > It depends who calls this helper. If only used inside exec_op,write_page_raw() and read_page_raw() also call meson_nfc_cmd_access(), but i don't find where constrain the "len". > it's not useful. If used outside, then if you want to clarify > things you may want to use: > > #define NFC_CMD_OP_LEN(cmd) FIELD_PREP(GENMASK(13, 0), (cmd)) > > This is by far my favorite construction. Could apply to many other > fields, like DMA_DIR, scrambler, etc. > >>>>> return; >>>>> } >>>>> @@ -573,7 +575,7 @@ static int meson_nfc_read_buf(struct nand_chip *nand, u8 *buf, int len) >>>>> if (ret) >>>>> goto out; >>>>> >>>>> - cmd = NFC_CMD_N2M | (len & GENMASK(13, 0)); >>>>> + cmd = NFC_CMD_N2M | len; >>>>> writel(cmd, nfc->reg_base + NFC_REG_CMD); >>>>> >>>>> meson_nfc_drain_cmd(nfc); >>>>> @@ -597,7 +599,7 @@ static int meson_nfc_write_buf(struct nand_chip *nand, u8 *buf, int len) >>>>> if (ret) >>>>> return ret; >>>>> >>>>> - cmd = NFC_CMD_M2N | (len & GENMASK(13, 0)); >>>>> + cmd = NFC_CMD_M2N | len; >>>>> writel(cmd, nfc->reg_base + NFC_REG_CMD); >>>>> >>>>> meson_nfc_drain_cmd(nfc); >>>>> @@ -1007,6 +1009,31 @@ meson_nand_op_put_dma_safe_output_buf(const struct nand_op_instr *instr, >>>>> kfree(buf); >>>>> } >>>>> >>>>> +static int meson_nfc_check_op(struct nand_chip *chip, >>>>> + const struct nand_operation *op) >>>>> +{ >>>>> + int op_id; >>>>> + >>>>> + for (op_id = 0; op_id < op->ninstrs; op_id++) { >>>>> + const struct nand_op_instr *instr; >>>>> + >>>>> + instr = &op->instrs[op_id]; >>>>> + >>>>> + switch (instr->type) { >>>>> + case NAND_OP_DATA_IN_INSTR: >>>>> + case NAND_OP_DATA_OUT_INSTR: >>>>> + if (instr->ctx.data.len > NFC_CMD_RAW_LEN) >>>>> + return -ENOTSUPP; >>>>> + >>>>> + break; >>>>> + default: >>>>> + break; >>>>> + } >>>>> + } >>>>> + >>>>> + return 0; >>>>> +} >>>>> + >>>>> static int meson_nfc_exec_op(struct nand_chip *nand, >>>>> const struct nand_operation *op, bool check_only) >>>>> { >>>>> @@ -1015,10 +1042,12 @@ static int meson_nfc_exec_op(struct nand_chip *nand, >>>>> const struct nand_op_instr *instr = NULL; >>>>> void *buf; >>>>> u32 op_id, delay_idle, cmd; >>>>> + int err; >>>>> int i; >>>>> >>>>> - if (check_only) >>>>> - return 0; >>>>> + err = meson_nfc_check_op(nand, op); >>>>> + if (err || check_only) >>>>> + return err; >>>>> >>>>> meson_nfc_select_chip(nand, op->cs); >>>>> for (op_id = 0; op_id < op->ninstrs; op_id++) { >>>>> @@ -1293,6 +1322,7 @@ static int meson_nand_attach_chip(struct nand_chip *nand) >>>>> struct meson_nfc_nand_chip *meson_chip = to_meson_nand(nand); >>>>> struct mtd_info *mtd = nand_to_mtd(nand); >>>>> int nsectors = mtd->writesize / 1024; >>>>> + int raw_writesize; >>>>> int ret; >>>>> >>>>> if (!mtd->name) { >>>>> @@ -1304,6 +1334,13 @@ static int meson_nand_attach_chip(struct nand_chip *nand) >>>>> return -ENOMEM; >>>>> } >>>>> >>>>> + raw_writesize = mtd->writesize + mtd->oobsize; >>>>> + if (raw_writesize > NFC_CMD_RAW_LEN) { >>>>> + dev_err(nfc->dev, "too big write size in raw mode: %d > %ld\n", >>>>> + raw_writesize, NFC_CMD_RAW_LEN); >>>>> + return -EINVAL; >>>>> + } >>>>> + >>>>> if (nand->bbt_options & NAND_BBT_USE_FLASH) >>>>> nand->bbt_options |= NAND_BBT_NO_OOB; >>>>> > > > Thanks, > Miquèl