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IB/umad: make sure write()s have sufficient data 

Make sure that userspace passes in enough data when sending a MAD.  We
always copy at least sizeof (struct ib_user_mad) + IB_MGMT_RMPP_HDR
bytes from userspace, so anything less is definitely invalid.  Also,
if the length is less than this limit, it's possible for the second
copy_from_user() to get a negative length and trigger a BUG().

Signed-off-by: Roland Dreier <rolandd@cisco.com>
This commit is contained in:
Roland Dreier 2005-11-18 14:18:26 -08:00
parent 48fd0d1fdd
commit eabc77935d
1 changed files with 1 additions and 1 deletions
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2
drivers/infiniband/core/user_mad.c
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@ -312,7 +312,7 @@ static ssize_t ib_umad_write(struct file *filp, const char __user *buf,
int ret, length, hdr_len, copy_offset;
int rmpp_active = 0;
if (count < sizeof (struct ib_user_mad))
if (count < sizeof (struct ib_user_mad) + IB_MGMT_RMPP_HDR)
return -EINVAL;
length = count - sizeof (struct ib_user_mad);