Messages in this thread Patch in this message | | | From | Arseniy Krasnov <> | Subject | [RFC PATCH v5 5/6] mtd: rawnand: meson: check buffer length | Date | Thu, 1 Jun 2023 09:18:48 +0300 |
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This NAND controller has limited buffer length, so check it before command execution to avoid length trim. Also check MTD write size on chip attach.
Signed-off-by: Arseniy Krasnov <AVKrasnov@sberdevices.ru> --- Changelog v4->v5: * Move length checks from functions 'meson_nfc_read/write_buf()' to 'meson_nfc_exec_op()'.
drivers/mtd/nand/raw/meson_nand.c | 22 +++++++++++++++++++--- 1 file changed, 19 insertions(+), 3 deletions(-)
diff --git a/drivers/mtd/nand/raw/meson_nand.c b/drivers/mtd/nand/raw/meson_nand.c index 23a73268421b..2a91916566f4 100644 --- a/drivers/mtd/nand/raw/meson_nand.c +++ b/drivers/mtd/nand/raw/meson_nand.c @@ -111,6 +111,8 @@ #define NFC_USER_BYTES 2 #define NFC_OOB_PER_ECC(nand) ((nand)->ecc.bytes + NFC_USER_BYTES) +#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); 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); @@ -1044,6 +1046,9 @@ static int meson_nfc_exec_op(struct nand_chip *nand, break; case NAND_OP_DATA_IN_INSTR: + if (instr->ctx.data.len > NFC_CMD_RAW_LEN) + return -EINVAL; + buf = meson_nand_op_get_dma_safe_input_buf(instr); if (!buf) return -ENOMEM; @@ -1052,6 +1057,9 @@ static int meson_nfc_exec_op(struct nand_chip *nand, break; case NAND_OP_DATA_OUT_INSTR: + if (instr->ctx.data.len > NFC_CMD_RAW_LEN) + return -EINVAL; + buf = meson_nand_op_get_dma_safe_output_buf(instr); if (!buf) return -ENOMEM; @@ -1293,6 +1301,7 @@ 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 +1313,13 @@ 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; -- 2.35.0
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