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NTB: Fix oops in debugfs when transport is half-up

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When the remote side is not up, we do not have all the context for the
transport, and that causes NULL ptr access. Have the debugfs reads check
to see if transport is up before we make access.

Signed-off-by: Dave Jiang <dave.jiang@intel.com>
Signed-off-by: Jon Mason <jdmason@kudzu.us>
This commit is contained in:
Dave Jiang 2015-07-13 08:07:11 -04:00 committed by Jon Mason
parent da4eb27a2c
commit 260bee9451
1 changed files with 5 additions and 1 deletions
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6
drivers/ntb/ntb_transport.c
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@ -439,13 +439,17 @@ static ssize_t debugfs_read(struct file *filp, char __user *ubuf, size_t count,
char *buf; char *buf;
ssize_t ret, out_offset, out_count; ssize_t ret, out_offset, out_count;
qp = filp->private_data;
if (!qp || !qp->link_is_up)
return 0;
out_count = 1000; out_count = 1000;
buf = kmalloc(out_count, GFP_KERNEL); buf = kmalloc(out_count, GFP_KERNEL);
if (!buf) if (!buf)
return -ENOMEM; return -ENOMEM;
qp = filp->private_data;
out_offset = 0; out_offset = 0;
out_offset += snprintf(buf + out_offset, out_count - out_offset, out_offset += snprintf(buf + out_offset, out_count - out_offset,
"NTB QP stats\n"); "NTB QP stats\n");