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spi: fsl_qspi: Fix qspi_op_rdsr memcpy issue

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In current driver, we always copy 4 bytes to the dest memory.
Actually the dest memory may be shorter than 4 bytes.
Add an argument to indicate the dest memory length.
Avoid writing memory outside of the bounds.

Signed-off-by: Gong Qianyu <Qianyu.Gong@freescale.com>
Reviewed-by: York Sun <york.sun@nxp.com>
This commit is contained in:
Gong Qianyu 2016-01-26 15:06:41 +08:00 committed by York Sun
parent 5207014deb
commit 940d2b89bf
1 changed files with 3 additions and 3 deletions
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6
drivers/spi/fsl_qspi.c
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@ -639,7 +639,7 @@ static void qspi_op_write(struct fsl_qspi_priv *priv, u8 *txbuf, u32 len)
qspi_write32(priv->flags, &regs->mcr, mcr_reg);
}
static void qspi_op_rdsr(struct fsl_qspi_priv *priv, u32 *rxbuf)
static void qspi_op_rdsr(struct fsl_qspi_priv *priv, void *rxbuf, u32 len)
{
struct fsl_qspi_regs *regs = priv->regs;
u32 mcr_reg, reg, data;
@ -662,7 +662,7 @@ static void qspi_op_rdsr(struct fsl_qspi_priv *priv, u32 *rxbuf)
if (reg & QSPI_RBSR_RDBFL_MASK) {
data = qspi_read32(priv->flags, &regs->rbdr[0]);
data = qspi_endian_xchg(data);
memcpy(rxbuf, &data, 4);
memcpy(rxbuf, &data, len);
qspi_write32(priv->flags, &regs->mcr,
qspi_read32(priv->flags, &regs->mcr) |
QSPI_MCR_CLR_RXF_MASK);
@ -751,7 +751,7 @@ int qspi_xfer(struct fsl_qspi_priv *priv, unsigned int bitlen,
} else if (priv->cur_seqid == QSPI_CMD_RDID)
qspi_op_rdid(priv, din, bytes);
else if (priv->cur_seqid == QSPI_CMD_RDSR)
qspi_op_rdsr(priv, din);
qspi_op_rdsr(priv, din, bytes);
#ifdef CONFIG_SPI_FLASH_BAR
else if ((priv->cur_seqid == QSPI_CMD_BRRD) ||
(priv->cur_seqid == QSPI_CMD_RDEAR)) {