IB/ipath: Only allow complete writes to flash

Don't allow a write to the eeprom from ipathfs unless the write is exactly
128 bytes and starts at offset 0.

Signed-off-by: Bryan O'Sullivan <bryan.osullivan@qlogic.com>
Signed-off-by: Roland Dreier <rolandd@cisco.com>

diff --git a/drivers/infiniband/hw/ipath/ipath_fs.c b/drivers/infiniband/hw/ipath/ipath_fs.c
index c8a8af0..a507d0b 100644 (file)
--- a/drivers/infiniband/hw/ipath/ipath_fs.c
+++ b/drivers/infiniband/hw/ipath/ipath_fs.c
@@ -356,19 +356,16 @@ static ssize_t flash_write(struct file *file, const char __user *buf,
 
        pos = *ppos;
 
-       if ( pos < 0) {
+       if (pos != 0) {
                ret = -EINVAL;
                goto bail;
        }
 
-       if (pos >= sizeof(struct ipath_flash)) {
-               ret = 0;
+       if (count != sizeof(struct ipath_flash)) {
+               ret = -EINVAL;
                goto bail;
        }
 
-       if (count > sizeof(struct ipath_flash) - pos)
-               count = sizeof(struct ipath_flash) - pos;
-
        tmp = kmalloc(count, GFP_KERNEL);
        if (!tmp) {
                ret = -ENOMEM;