net/9p: Return error on read with NULL buffer
This patch ensures that a read(fd, NULL, 10) returns EFAULT on a 9p file. Signed-off-by: NSanchit Garg <sancgarg@linux.vnet.ibm.com> Signed-off-by: NAneesh Kumar K.V <aneesh.kumar@linux.vnet.ibm.com> Signed-off-by: NEric Van Hensbergen <ericvh@gmail.com>
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