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bpf: Do not increment tailcall count when prog is NULL

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Currently, tailcall count is incremented in the interpreter even when
tailcall fails due to non-existent prog. Fix this by holding off on
the tailcall count increment until after NULL check on the prog.

Suggested-by: Ilya Leoshkevich <iii@linux.ibm.com>
Signed-off-by: Hari Bathini <hbathini@linux.ibm.com>
Link: https://lore.kernel.org/r/20260220062959.195101-1-hbathini@linux.ibm.com
Signed-off-by: Alexei Starovoitov <ast@kernel.org>
This commit is contained in:
Hari Bathini 2026-02-20 11:59:58 +05:30 committed by Alexei Starovoitov
parent 055d8dd553
commit 3733f4be28
1 changed files with 2 additions and 2 deletions
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4
kernel/bpf/core.c
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@ -2060,12 +2060,12 @@ static u64 ___bpf_prog_run(u64 *regs, const struct bpf_insn *insn)
if (unlikely(tail_call_cnt >= MAX_TAIL_CALL_CNT))
goto out;
tail_call_cnt++;
prog = READ_ONCE(array->ptrs[index]);
if (!prog)
goto out;
tail_call_cnt++;
/* ARG1 at this point is guaranteed to point to CTX from
* the verifier side due to the fact that the tail call is
* handled like a helper, that is, bpf_tail_call_proto,