Description
In the Linux kernel, the following vulnerability has been resolved: virtio-net: fix received length check in big packets Since commit 4959aebba8c0 ("virtio-net: use mtu size as buffer length for big packets"), when guest gso is off, the allocated size for big packets is not MAX_SKB_FRAGS * PAGE_SIZE anymore but depends on negotiated MTU. The number of allocated frags for big packets is stored in vi->big_packets_num_skbfrags. Because the host announced buffer length can be malicious (e.g. the host vhost_net driver's get_rx_bufs is modified to announce incorrect length), we need a check in virtio_net receive path. Currently, the check is not adapted to the new change which can lead to NULL page pointer dereference in the below while loop when receiving length that is larger than the allocated one. This commit fixes the received length check corresponding to the new change.
Product status
4959aebba8c06992abafa09d1e80965e0825af54 (git) before 82f9028e83944a9eee5229cbc6fee9be1de8a62d
4959aebba8c06992abafa09d1e80965e0825af54 (git) before 946dec89c41726b94d31147ec528b96af0be1b5a
4959aebba8c06992abafa09d1e80965e0825af54 (git) before 82fe78065450d2d07f36a22e2b6b44955cf5ca5b
4959aebba8c06992abafa09d1e80965e0825af54 (git) before 3e9d89f2ecd3636bd4cbdfd0b2dfdaf58f9882e2
4959aebba8c06992abafa09d1e80965e0825af54 (git) before 0c716703965ffc5ef4311b65cb5d84a703784717
6.1
Any version before 6.1
6.1.159 (semver)
6.6.117 (semver)
6.12.58 (semver)
6.17.8 (semver)
6.18 (original_commit_for_fix)
References
git.kernel.org/...c/82f9028e83944a9eee5229cbc6fee9be1de8a62d
git.kernel.org/...c/946dec89c41726b94d31147ec528b96af0be1b5a
git.kernel.org/...c/82fe78065450d2d07f36a22e2b6b44955cf5ca5b
git.kernel.org/...c/3e9d89f2ecd3636bd4cbdfd0b2dfdaf58f9882e2
git.kernel.org/...c/0c716703965ffc5ef4311b65cb5d84a703784717
