[PATCH][next] NTB: ntb_tool: fix memory leak on 'buf' on error exit path

[Colin King]

From: Colin Ian King <colin.k...@canonical.com>

Currently there is a memory leak on buf when the call to ntb_mw_get_align
fails.  Add an exit err label and jump to this so that kfree on buf frees
the memory.

Detected by CoverityScan, CID#1464286 ("Resource leak")

Fixes: d637628ce00c ("NTB: ntb_tool: Add full multi-port NTB API support")
Signed-off-by: Colin Ian King <colin.k...@canonical.com>
---
 drivers/ntb/test/ntb_tool.c | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/drivers/ntb/test/ntb_tool.c b/drivers/ntb/test/ntb_tool.c
index 920fc9b161b0..d592c0ffbd19 100644
--- a/drivers/ntb/test/ntb_tool.c
+++ b/drivers/ntb/test/ntb_tool.c
@@ -659,7 +659,7 @@ static ssize_t tool_mw_trans_read(struct file *filep, char 
__user *ubuf,
        ret = ntb_mw_get_align(inmw->tc->ntb, inmw->pidx, inmw->widx,
                               &addr_align, &size_align, &size_max);
        if (ret)
-               return ret;
+               goto err;
 
        off += scnprintf(buf + off, buf_size - off,
                         "Inbound MW     \t%d\n",
@@ -694,6 +694,8 @@ static ssize_t tool_mw_trans_read(struct file *filep, char 
__user *ubuf,
                         &size_max);
 
        ret = simple_read_from_buffer(ubuf, size, offp, buf, off);
+
+err:
        kfree(buf);
 
        return ret;
-- 
2.15.1