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IB/ocrdma: fix out of bounds access to local buffer 

In write to debugfs file 'resource_stats' the local buffer 'tmp_str' is
written at index 'count-1' where 'count' is the size of the write, so
potentially 0.

This patch filters odd values for the write size/position to avoid this
type of problem.

Signed-off-by: Michael Mera <dev@michaelmera.com>
Reviewed-by: Leon Romanovsky <leonro@mellanox.com>
Signed-off-by: Doug Ledford <dledford@redhat.com>
This commit is contained in:
Michael Mera 2017-05-01 15:41:16 +09:00 committed by Doug Ledford
parent b03ee4ca0c
commit 062d0f22a3
1 changed files with 1 additions and 1 deletions
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2
drivers/infiniband/hw/ocrdma/ocrdma_stats.c
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@ -643,7 +643,7 @@ static ssize_t ocrdma_dbgfs_ops_write(struct file *filp,
struct ocrdma_stats *pstats = filp->private_data;
struct ocrdma_dev *dev = pstats->dev;
if (count > 32)
if (*ppos != 0 || count == 0 || count > sizeof(tmp_str))
goto err;
if (copy_from_user(tmp_str, buffer, count))