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dsp56k: prevent a harmless underflow

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There is a mistake here where we don't allow "len" to be zero but we
allow negative lengths.  It's basically harmless in this case, but the
underflow makes my static checker complain.

Signed-off-by: Dan Carpenter <dan.carpenter@oracle.com>
Reviewed-by: Arnd Bergmann <arnd@arndb.de>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Dan Carpenter 2016-07-13 13:11:19 +03:00 committed by Greg Kroah-Hartman
parent 077e2642fb
commit 2419036411
1 changed files with 1 additions and 1 deletions
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2
drivers/char/dsp56k.c
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@ -325,7 +325,7 @@ static long dsp56k_ioctl(struct file *file, unsigned int cmd,
if(get_user(bin, &binary->bin) < 0)
return -EFAULT;
if (len == 0) {
if (len <= 0) {
return -EINVAL; /* nothing to upload?!? */
}
if (len > DSP56K_MAX_BINARY_LENGTH) {