Description
In the Linux kernel, the following vulnerability has been resolved: net:emac/emac-mac: Fix a use after free in emac_mac_tx_buf_send In emac_mac_tx_buf_send, it calls emac_tx_fill_tpd(..,skb,..). If some error happens in emac_tx_fill_tpd(), the skb will be freed via dev_kfree_skb(skb) in error branch of emac_tx_fill_tpd(). But the freed skb is still used via skb->len by netdev_sent_queue(,skb->len). As i observed that emac_tx_fill_tpd() haven't modified the value of skb->len, thus my patch assigns skb->len to 'len' before the possible free and use 'len' instead of skb->len later.
Affected products
Version statuses are supplied by the assigning organization. Consult the original record for detailed ranges and platform conditions.
Linux Linux
Default version status: unaffected
b9b17debc69d27cd55e21ee51a5ba7fc50a426cf to < c7f75d11fe72913d2619f97b2334b083cd7bb955affectedb9b17debc69d27cd55e21ee51a5ba7fc50a426cf to < dc1b438a35773d030be0ee80d9c635c3e558a322affectedb9b17debc69d27cd55e21ee51a5ba7fc50a426cf to < 16d8c44be52e3650917736d45f5904384a9da834affectedb9b17debc69d27cd55e21ee51a5ba7fc50a426cf to < 55fcdd1258faaecca74b91b88cc0921f9edd775daffectedb9b17debc69d27cd55e21ee51a5ba7fc50a426cf to < 9dc373f74097edd0e35f3393d6248eda8d1ba99daffectedb9b17debc69d27cd55e21ee51a5ba7fc50a426cf to < 8c06f34785068b87e2b560534c77c163d6c6dca7affectedb9b17debc69d27cd55e21ee51a5ba7fc50a426cf to < e407495ba6788a67d1bd41714158c079e340879baffectedb9b17debc69d27cd55e21ee51a5ba7fc50a426cf to < 6d72e7c767acbbdd44ebc7d89c6690b405b32b57affected
Linux Linux
Default version status: affected
4.9affected0 to < 4.9unaffected4.9.269 to ≤ 4.9.*unaffected4.14.233 to ≤ 4.14.*unaffected4.19.191 to ≤ 4.19.*unaffected5.4.119 to ≤ 5.4.*unaffected5.10.37 to ≤ 5.10.*unaffected5.11.21 to ≤ 5.11.*unaffected5.12.4 to ≤ 5.12.*unaffected5.13 to ≤ *unaffected
References
- https://git.kernel.org/stable/c/c7f75d11fe72913d2619f97b2334b083cd7bb955 ↗
- https://git.kernel.org/stable/c/dc1b438a35773d030be0ee80d9c635c3e558a322 ↗
- https://git.kernel.org/stable/c/16d8c44be52e3650917736d45f5904384a9da834 ↗
- https://git.kernel.org/stable/c/55fcdd1258faaecca74b91b88cc0921f9edd775d ↗
- https://git.kernel.org/stable/c/9dc373f74097edd0e35f3393d6248eda8d1ba99d ↗
- https://git.kernel.org/stable/c/8c06f34785068b87e2b560534c77c163d6c6dca7 ↗
- https://git.kernel.org/stable/c/e407495ba6788a67d1bd41714158c079e340879b ↗
- https://git.kernel.org/stable/c/6d72e7c767acbbdd44ebc7d89c6690b405b32b57 ↗