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| author |   Mark Tomlinson <mark.tomlinson@alliedtelesis.co.nz> | 2015-05-18 12:01:48 +1200 |
|---|---|---|
| committer |   Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2015-05-24 12:43:50 -0700 |
| commit | da555db6b06340e3f6b4b0a0448c30bebfe23b0a (patch) | |
| tree | 872aae27524cdd0ff3c9da0bd0efa679ad6bf66c /drivers/tty/n_tty.c | |
| parent | serial: imx: Fix DMA handling for IDLE condition aborts (diff) | |
| download | linux-dev-da555db6b06340e3f6b4b0a0448c30bebfe23b0a.tar.xz linux-dev-da555db6b06340e3f6b4b0a0448c30bebfe23b0a.zip | |
n_tty: Fix calculation of size in canon_copy_from_read_buf
There was a hardcoded value of 4096 which should have been N_TTY_BUF_SIZE.
This caused reads from tty to fail with EFAULT when they shouldn't have
done if N_TTY_BUF_SIZE was declared to be something other than 4096.
Signed-off-by: Mark Tomlinson <mark.tomlinson@alliedtelesis.co.nz>
Reviewed-by: Peter Hurley <peter@hurleysoftware.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'drivers/tty/n_tty.c')
| -rw-r--r-- | drivers/tty/n_tty.c | 4 |
1 files changed, 2 insertions, 2 deletions
diff --git a/drivers/tty/n_tty.c b/drivers/tty/n_tty.c index cc57a3a6b02b..759604e57b24 100644 --- a/drivers/tty/n_tty.c +++ b/drivers/tty/n_tty.c @@ -2070,8 +2070,8 @@ static int canon_copy_from_read_buf(struct tty_struct *tty, size = N_TTY_BUF_SIZE - tail; n = eol - tail; - if (n > 4096) - n += 4096; + if (n > N_TTY_BUF_SIZE) + n += N_TTY_BUF_SIZE; n += found; c = n; |