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s390/bpf,jit: initialize A register if 1st insn is BPF_S_LDX_B_MSH
commit 6e0de817594c61f3b392a9245deeb09609ec707d upstream. The A register needs to be initialized to zero in the prolog if the first instruction of the BPF program is BPF_S_LDX_B_MSH to prevent leaking the content of %r5 to user space. Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
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@ -243,7 +243,6 @@ static void bpf_jit_noleaks(struct bpf_jit *jit, struct sock_filter *filter)
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case BPF_S_LD_W_IND:
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case BPF_S_LD_H_IND:
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case BPF_S_LD_B_IND:
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case BPF_S_LDX_B_MSH:
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case BPF_S_LD_IMM:
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case BPF_S_LD_MEM:
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case BPF_S_MISC_TXA:
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