dccp: Fix memleak in __feat_register_sp [Linux 5.1]

dccp: Fix memleak in __feat_register_sp [Linux 5.1]

This Linux kernel change "dccp: Fix memleak in __feat_register_sp" is included in the Linux 5.1 release. This change is authored by YueHaibing <yuehaibing [at] huawei.com> on Mon Apr 1 09:35:54 2019 +0800. The commit for this change in Linux stable tree is 1d3ff09 (patch).

dccp: Fix memleak in __feat_register_sp

If dccp_feat_push_change fails, we forget free the mem
which is alloced by kmemdup in dccp_feat_clone_sp_val.

Reported-by: Hulk Robot <hulkci@huawei.com>
Fixes: e8ef967a54f4 ("dccp: Registration routines for changing feature values")
Reviewed-by: Mukesh Ojha <mojha@codeaurora.org>
Signed-off-by: YueHaibing <yuehaibing@huawei.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

There are 7 lines of Linux source code added/deleted in this change. Code changes to Linux kernel are as follows.

 net/dccp/feat.c | 7 ++++++-
 1 file changed, 6 insertions(+), 1 deletion(-)

diff --git a/net/dccp/feat.c b/net/dccp/feat.c
index f227f00..db87d9f 100644
--- a/net/dccp/feat.c
+++ b/net/dccp/feat.c
@@ -738,7 +738,12 @@ static int __feat_register_sp(struct list_head *fn, u8 feat, u8 is_local,
    if (dccp_feat_clone_sp_val(&fval, sp_val, sp_len))
        return -ENOMEM;

-   return dccp_feat_push_change(fn, feat, is_local, mandatory, &fval);
+   if (dccp_feat_push_change(fn, feat, is_local, mandatory, &fval)) {
+       kfree(fval.sp.vec);
+       return -ENOMEM;
+   }
+   return 0;


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