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IB/hfi1: Validate the TID count before using it 

Improve the safety of the code by validating the user supplied
tidcnt before use.

Reviewed-by: Mitko Haralanov <mitko.haralanov@intel.com>
Reviewed-by: Dennis Dalessandro <dennis.dalessandro@intel.com>
Signed-off-by: Michael J. Ruhl <michael.j.ruhl@intel.com>
Signed-off-by: Dennis Dalessandro <dennis.dalessandro@intel.com>
Signed-off-by: Doug Ledford <dledford@redhat.com>
This commit is contained in:
Michael J. Ruhl 2017-04-09 10:16:03 -07:00 committed by Doug Ledford
parent aad9ff97dd
commit db730894f4
1 changed files with 3 additions and 0 deletions
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3
drivers/infiniband/hw/hfi1/user_exp_rcv.c
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@ -579,6 +579,9 @@ int hfi1_user_exp_rcv_clear(struct file *fp, struct hfi1_tid_info *tinfo)
u32 *tidinfo;
unsigned tididx;
if (unlikely(tinfo->tidcnt > fd->tid_used))
return -EINVAL;
tidinfo = memdup_user((void __user *)(unsigned long)tinfo->tidlist,
sizeof(tidinfo[0]) * tinfo->tidcnt);
if (IS_ERR(tidinfo))