s390/bpf: Do not increment tailcall count when prog is NULL

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Currently tail calling a non-existent prog results in tailcall count
increment. This is what the interpreter is doing, but this is clearly
wrong, so replace load-and-increment and compare-and-jump with load
and compare-and-jump, conditionally followed by increment and store.

Reported-by: Hari Bathini <hbathini@linux.ibm.com>
Signed-off-by: Ilya Leoshkevich <iii@linux.ibm.com>
Link: https://lore.kernel.org/r/20260217161058.101346-1-iii@linux.ibm.com
Signed-off-by: Alexei Starovoitov <ast@kernel.org>

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Ilya Leoshkevich 2026-02-17 17:10:06 +01:00 • committed by Alexei Starovoitov

parent 3733f4be28

commit e4094d56c5

1 changed files with 15 additions and 8 deletions

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arch/s390/net/bpf_jit_comp.c

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