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bpf: verifier: reorder stack size check with dead code sanitization 

Reorder the calls to check_max_stack_depth() and sanitize_dead_code()
to separate functions which can rewrite instructions from pure checks.

No functional changes.

Signed-off-by: Jakub Kicinski <jakub.kicinski@netronome.com>
Reviewed-by: Jiong Wang <jiong.wang@netronome.com>
Signed-off-by: Daniel Borkmann <daniel@iogearbox.net>
This commit is contained in:
Jakub Kicinski 2018-12-19 22:13:06 -08:00 committed by Daniel Borkmann
parent 14507e35bd
commit 9b38c4056b
1 changed files with 4 additions and 3 deletions
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7
kernel/bpf/verifier.c
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@ -6982,12 +6982,13 @@ skip_full_check:
while (!pop_stack(env, NULL, NULL));
free_states(env);
if (ret == 0)
sanitize_dead_code(env);
if (ret == 0)
ret = check_max_stack_depth(env);
/* instruction rewrites happen after this point */
if (ret == 0)
sanitize_dead_code(env);
if (ret == 0)
/* program is valid, convert *(u32*)(ctx + off) accesses */
ret = convert_ctx_accesses(env);