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The default branch in sigd_send() calls sock_put() and returns -EINVAL
without freeing the skb, while all other exit paths do so. Add the
missing dev_kfree_skb() before sock_put() to fix the leak.
Fixes: 1da177e4c3 ("Linux-2.6.12-rc2")
Signed-off-by: Wei Yang <albinwyang@tencent.com>
Link: https://patch.msgid.link/20260509122358.1102997-1-albin_yang@163.com
Signed-off-by: Jakub Kicinski <kuba@kernel.org>