[PATCH v1] mtd: rawnand: meson: check buffer length
Arseniy Krasnov
AVKrasnov at sberdevices.ru
Mon Jun 5 12:10:46 PDT 2023
Meson 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 at sberdevices.ru>
---
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 074e14225c06..bfb5363cac23 100644
--- a/drivers/mtd/nand/raw/meson_nand.c
+++ b/drivers/mtd/nand/raw/meson_nand.c
@@ -108,6 +108,8 @@
#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;
@@ -280,7 +282,7 @@ 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;
}
@@ -544,7 +546,7 @@ 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);
@@ -568,7 +570,7 @@ 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);
@@ -936,6 +938,9 @@ 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;
@@ -944,6 +949,9 @@ 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;
@@ -1181,6 +1189,7 @@ 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) {
@@ -1192,6 +1201,13 @@ 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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