bpf: fix NULL pointer dereference in print_reg_state() #6024
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Syzkaller reported a general protection fault due to a NULL pointer dereference in print_reg_state() when accessing reg->map_ptr without checking if it is NULL. The existing code assumes reg->map_ptr is always valid before dereferencing reg->map_ptr->name, reg->map_ptr->key_size, and reg->map_ptr->value_size. Fix this by adding explicit NULL checks before accessing reg->map_ptr and its members. This prevents crashes when reg->map_ptr is NULL, improving the robustness of the BPF verifier's verbose logging. Reported-by: [email protected] Signed-off-by: Brahmajit Das <[email protected]>
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Upstream branch: 348f611 |
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Pull request for series with
subject: bpf: fix NULL pointer dereference in print_reg_state()
version: 1
url: https://patchwork.kernel.org/project/netdevbpf/list/?series=1005368