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authorTINNES Julien RD-MAPS-ISS <julien.tinnes@francetelecom.com>2005-06-23 11:10:08 +0400
committerLinus Torvalds <torvalds@ppc970.osdl.org>2005-06-23 20:45:31 +0400
commitd9ad7ef1979d65a4200847ec91be5b9ad961eba8 (patch)
tree058dceba2670ee229a4fdf6992760260b0f0e002 /drivers/char/amiserial.c
parent17abee3d50685b8ef4e38d37abacf8b650a3a387 (diff)
downloadlinux-d9ad7ef1979d65a4200847ec91be5b9ad961eba8.tar.xz
[PATCH] Potential null pointer dereference in amiga serial driver
A pointer is dereferenced before it is null-checked. Signed-off-by: Andrew Morton <akpm@osdl.org> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
Diffstat (limited to 'drivers/char/amiserial.c')
-rw-r--r--drivers/char/amiserial.c18
1 files changed, 14 insertions, 4 deletions
diff --git a/drivers/char/amiserial.c b/drivers/char/amiserial.c
index 1dc4259213a6..777bc499bbbd 100644
--- a/drivers/char/amiserial.c
+++ b/drivers/char/amiserial.c
@@ -861,13 +861,18 @@ static void change_speed(struct async_struct *info,
static void rs_put_char(struct tty_struct *tty, unsigned char ch)
{
- struct async_struct *info = (struct async_struct *)tty->driver_data;
+ struct async_struct *info;
unsigned long flags;
+ if (!tty)
+ return;
+
+ info = tty->driver_data;
+
if (serial_paranoia_check(info, tty->name, "rs_put_char"))
return;
- if (!tty || !info->xmit.buf)
+ if (!info->xmit.buf)
return;
local_irq_save(flags);
@@ -910,13 +915,18 @@ static void rs_flush_chars(struct tty_struct *tty)
static int rs_write(struct tty_struct * tty, const unsigned char *buf, int count)
{
int c, ret = 0;
- struct async_struct *info = (struct async_struct *)tty->driver_data;
+ struct async_struct *info;
unsigned long flags;
+ if (!tty)
+ return 0;
+
+ info = tty->driver_data;
+
if (serial_paranoia_check(info, tty->name, "rs_write"))
return 0;
- if (!tty || !info->xmit.buf || !tmp_buf)
+ if (!info->xmit.buf || !tmp_buf)
return 0;
local_save_flags(flags);