From: Dan Carpenter <dan.carpenter@oracle.com>
To: Alexander Viro <viro@zeniv.linux.org.uk>
Cc: linux-fsdevel@vger.kernel.org, kernel-janitors@vger.kernel.org
Subject: [patch] compat_ioctl: fix an underflow issue (harmless)
Date: Fri, 1 Nov 2013 13:24:48 +0300 [thread overview]
Message-ID: <20131101102448.GE29795@longonot.mountain> (raw)
We cap "nmsgs" at I2C_RDRW_IOCTL_MAX_MSGS (42) but the current code
allows negative values. It's harmless but it makes my static checker
upset so I've made nsmgs unsigned.
Signed-off-by: Dan Carpenter <dan.carpenter@oracle.com>
diff --git a/fs/compat_ioctl.c b/fs/compat_ioctl.c
index 5d19acf..2cb2fd2 100644
--- a/fs/compat_ioctl.c
+++ b/fs/compat_ioctl.c
@@ -680,7 +680,8 @@ static int do_i2c_rdwr_ioctl(unsigned int fd, unsigned int cmd,
struct i2c_msg __user *tmsgs;
struct i2c_msg32 __user *umsgs;
compat_caddr_t datap;
- int nmsgs, i;
+ u32 nmsgs;
+ int i;
if (get_user(nmsgs, &udata->nmsgs))
return -EFAULT;
reply other threads:[~2013-11-01 10:24 UTC|newest]
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