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| author | Takashi Iwai <tiwai@suse.de> | 2020-03-11 10:29:30 +0100 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2020-03-18 12:59:29 +0100 |
| commit | e39c0ffe8cc3cce212928168236bfd0c22965235 (patch) | |
| tree | 36e0cecb0e86de0a5d51f04cfe0ca70101cd4d4d /drivers/tty | |
| parent | e2c2e7987106efbb576d7a46fbc9298fafd0b844 (diff) | |
| download | linux-e39c0ffe8cc3cce212928168236bfd0c22965235.tar.gz linux-e39c0ffe8cc3cce212928168236bfd0c22965235.tar.bz2 linux-e39c0ffe8cc3cce212928168236bfd0c22965235.zip | |
tty: serial: pch_uart: Use scnprintf() for avoiding potential buffer overflow
Since snprintf() returns the would-be-output size instead of the
actual output size, the succeeding calls may go beyond the given
buffer limit. Fix it by replacing with scnprintf().
Signed-off-by: Takashi Iwai <tiwai@suse.de>
Link: https://lore.kernel.org/r/20200311092930.24433-1-tiwai@suse.de
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'drivers/tty')
| -rw-r--r-- | drivers/tty/serial/pch_uart.c | 22 |
1 files changed, 11 insertions, 11 deletions
diff --git a/drivers/tty/serial/pch_uart.c b/drivers/tty/serial/pch_uart.c index 0a96217dba67..40fa7a27722d 100644 --- a/drivers/tty/serial/pch_uart.c +++ b/drivers/tty/serial/pch_uart.c @@ -310,32 +310,32 @@ static ssize_t port_show_regs(struct file *file, char __user *user_buf, if (!buf) return 0; - len += snprintf(buf + len, PCH_REGS_BUFSIZE - len, + len += scnprintf(buf + len, PCH_REGS_BUFSIZE - len, "PCH EG20T port[%d] regs:\n", priv->port.line); - len += snprintf(buf + len, PCH_REGS_BUFSIZE - len, + len += scnprintf(buf + len, PCH_REGS_BUFSIZE - len, "=================================\n"); - len += snprintf(buf + len, PCH_REGS_BUFSIZE - len, + len += scnprintf(buf + len, PCH_REGS_BUFSIZE - len, "IER: \t0x%02x\n", ioread8(priv->membase + UART_IER)); - len += snprintf(buf + len, PCH_REGS_BUFSIZE - len, + len += scnprintf(buf + len, PCH_REGS_BUFSIZE - len, "IIR: \t0x%02x\n", ioread8(priv->membase + UART_IIR)); - len += snprintf(buf + len, PCH_REGS_BUFSIZE - len, + len += scnprintf(buf + len, PCH_REGS_BUFSIZE - len, "LCR: \t0x%02x\n", ioread8(priv->membase + UART_LCR)); - len += snprintf(buf + len, PCH_REGS_BUFSIZE - len, + len += scnprintf(buf + len, PCH_REGS_BUFSIZE - len, "MCR: \t0x%02x\n", ioread8(priv->membase + UART_MCR)); - len += snprintf(buf + len, PCH_REGS_BUFSIZE - len, + len += scnprintf(buf + len, PCH_REGS_BUFSIZE - len, "LSR: \t0x%02x\n", ioread8(priv->membase + UART_LSR)); - len += snprintf(buf + len, PCH_REGS_BUFSIZE - len, + len += scnprintf(buf + len, PCH_REGS_BUFSIZE - len, "MSR: \t0x%02x\n", ioread8(priv->membase + UART_MSR)); - len += snprintf(buf + len, PCH_REGS_BUFSIZE - len, + len += scnprintf(buf + len, PCH_REGS_BUFSIZE - len, "BRCSR: \t0x%02x\n", ioread8(priv->membase + PCH_UART_BRCSR)); lcr = ioread8(priv->membase + UART_LCR); iowrite8(PCH_UART_LCR_DLAB, priv->membase + UART_LCR); - len += snprintf(buf + len, PCH_REGS_BUFSIZE - len, + len += scnprintf(buf + len, PCH_REGS_BUFSIZE - len, "DLL: \t0x%02x\n", ioread8(priv->membase + UART_DLL)); - len += snprintf(buf + len, PCH_REGS_BUFSIZE - len, + len += scnprintf(buf + len, PCH_REGS_BUFSIZE - len, "DLM: \t0x%02x\n", ioread8(priv->membase + UART_DLM)); iowrite8(lcr, priv->membase + UART_LCR); |