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bh=brErExzOHNabk0CSQkJ1caXkP+Gt3vH7Sgg/pPYiSEI=; c=relaxed/relaxed; d=a-eberle.de; h=content-type:mime-version:subject:from:to:message-id:date; s=hse1; t=1737113451; v=1; b=oK/RiNc1KFC9vOCt2aasq1Kg3qMhNFiKzouV6P9zrYJIOORAKVlBMCiBx6szuVFuS1zRh+o8 IAxsl18orUbRz/PeINq44ve46PD35/fnnnSbbccub0+BtvCti8fqnUIu82EEzqio1WYuzQZ9ZLd NCQFoZRAG07GgYvgy4Pac2fls4b/4gVUEk3EvTFhPdUCUGGAaaO18G8uDGHH0mobpoHD0VKUwke GjU8PeFdbHjTLsuPjiPfenaC9Bi+b7ME2IJyXJavArMTuRpQG6iCH3vCWu08+28rGYnxpd8zNuf Xwb1Og4n7km1jowJ1jit6OjcMHXtFIS4y2pzS06jG0Emw== Hello Eric, Am 26. Nov 14:43 hat Eric Dumazet geschrieben: > syzbot is able to feed a packet with 14 bytes, pretending > it is a vlan one. > > Since fill_frame_info() is relying on skb->mac_len already, > extend the check to cover this case. thanks for addressing this szybot finding. Unfortunately, this seems to cause issues with VLAN tagged frames being dropped from a PRP interface. My setup consists of a custom embedded system equipped with v6.6 kernel, recently updated from v6.6.62 to v6.6.69. In order to gain support for VLAN tagged messages on top of PRP, I have applied first patch of the series (see msgid 20241106091710.3308519-2-danishanwar@ti.com) that is currently integrated with v6.13. Now I want to send GOOSE messages (L2 broadcast messages with VLAN header, including id=0 and QoS information) via the PRP interface. With v6.6.62 this works as expected, with v6.6.69 the functionality stopped again, with all VLAN-tagged frames being dropped from the PRP interface. By reverting this fix locally, I was able to restore the desired functionality. But I do not iyet understand, why this fix breaks sending of VLAN tagged frames in general. Do you already know about this side effect? Can you guide me to narrow down this issue? Best regards Stephan