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i2o: check copy_from_user() size parameter 

Limit the size of the copy so we don't corrupt memory.  Hopefully this
can only be called by root, but fixing this makes the static checkers
happier.

Signed-off-by: Dan Carpenter <dan.carpenter@oracle.com>
Cc: Jiri Kosina <jkosina@suse.cz>
Cc: Masanari Iida <standby24x7@gmail.com>
Cc: Alan Cox <alan@linux.intel.com>
Cc: Guenter Roeck <linux@roeck-us.net>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Dan Carpenter 2013-04-30 15:27:47 -07:00 committed by Linus Torvalds
parent 79bae42d51
commit 9151b3982d
1 changed files with 10 additions and 0 deletions
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10
drivers/message/i2o/i2o_config.c
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@ -687,6 +687,11 @@ static int i2o_cfg_passthru32(struct file *file, unsigned cmnd,
}
size = size >> 16;
size *= 4;
if (size > sizeof(rmsg)) {
rcode = -EINVAL;
goto sg_list_cleanup;
}
/* Copy in the user's I2O command */
if (copy_from_user(rmsg, user_msg, size)) {
rcode = -EFAULT;
@ -922,6 +927,11 @@ static int i2o_cfg_passthru(unsigned long arg)
}
size = size >> 16;
size *= 4;
if (size > sizeof(rmsg)) {
rcode = -EFAULT;
goto sg_list_cleanup;
}
/* Copy in the user's I2O command */
if (copy_from_user(rmsg, user_msg, size)) {
rcode = -EFAULT;