* [patch] compat_ioctl: fix an underflow issue (harmless)
@ 2013-11-01 10:24 Dan Carpenter
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From: Dan Carpenter @ 2013-11-01 10:24 UTC (permalink / raw)
To: Alexander Viro; +Cc: linux-fsdevel, kernel-janitors
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;
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2013-11-01 10:24 [patch] compat_ioctl: fix an underflow issue (harmless) Dan Carpenter
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