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fs/compat_ioctl.c: fix an underflow issue (harmless)

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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>
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 2014-01-21 15:48:43 -08:00 committed by Linus Torvalds
parent 0afaa12047
commit 38316c8ab7
1 changed files with 2 additions and 1 deletions
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3
fs/compat_ioctl.c
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@ -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;