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drivers/char/synclink_gt.c: fix information leak to userland 

Structures tmp_params and new_line are copied to userland with some
padding fields unitialized.  It leads to leaking of stack memory.

Signed-off-by: Vasiliy Kulikov <segooon@gmail.com>
Acked-by: Paul Fulghum <paulkf@microgate.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Vasiliy Kulikov 2010-10-27 15:34:22 -07:00 committed by Linus Torvalds
parent b9b1134260
commit ed77ed6112
1 changed files with 3 additions and 0 deletions
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3
drivers/char/synclink_gt.c
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@ -1132,6 +1132,7 @@ static long get_params32(struct slgt_info *info, struct MGSL_PARAMS32 __user *us
struct MGSL_PARAMS32 tmp_params;
DBGINFO(("%s get_params32\n", info->device_name));
memset(&tmp_params, 0, sizeof(tmp_params));
tmp_params.mode = (compat_ulong_t)info->params.mode;
tmp_params.loopback = info->params.loopback;
tmp_params.flags = info->params.flags;
@ -1617,6 +1618,8 @@ static int hdlcdev_ioctl(struct net_device *dev, struct ifreq *ifr, int cmd)
if (cmd != SIOCWANDEV)
return hdlc_ioctl(dev, ifr, cmd);
memset(&new_line, 0, sizeof(new_line));
switch(ifr->ifr_settings.type) {
case IF_GET_IFACE: /* return current sync_serial_settings */