Commit 13e2d518 authored by Dan Carpenter's avatar Dan Carpenter Committed by David S. Miller

bna: integer overflow bug in debugfs

We could allocate less memory than intended because we do:

	bnad->regdata = kzalloc(len << 2, GFP_KERNEL);

The shift can overflow leading to a crash.  This is debugfs code so the
impact is very small.

Fixes: 7afc5dbd ("bna: Add debugfs interface.")
Signed-off-by: default avatarDan Carpenter <dan.carpenter@oracle.com>
Acked-by: default avatarRasesh Mody <rasesh.mody@cavium.com>
Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
parent 6bd845d1
...@@ -325,7 +325,7 @@ bnad_debugfs_write_regrd(struct file *file, const char __user *buf, ...@@ -325,7 +325,7 @@ bnad_debugfs_write_regrd(struct file *file, const char __user *buf,
return PTR_ERR(kern_buf); return PTR_ERR(kern_buf);
rc = sscanf(kern_buf, "%x:%x", &addr, &len); rc = sscanf(kern_buf, "%x:%x", &addr, &len);
if (rc < 2) { if (rc < 2 || len > UINT_MAX >> 2) {
netdev_warn(bnad->netdev, "failed to read user buffer\n"); netdev_warn(bnad->netdev, "failed to read user buffer\n");
kfree(kern_buf); kfree(kern_buf);
return -EINVAL; return -EINVAL;
......
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