diff mbox series

[bpf-next,v3,1/3] bpf: fix overflow check in adjust_jmp_off()

Message ID 20240712080127.136608-2-shung-hsi.yu@suse.com (mailing list archive)
State Accepted
Commit 4a04b4f0de59dd5c621e78f15803ee0b0544eeb8
Delegated to: BPF
Headers show
Series Use overflow.h helpers to check for overflows | expand

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Commit Message

Shung-Hsi Yu July 12, 2024, 8:01 a.m. UTC 
adjust_jmp_off() incorrectly used the insn->imm field for all overflow check,
which is incorrect as that should only be done or the BPF_JMP32 | BPF_JA case,
not the general jump instruction case. Fix it by using insn->off for overflow
check in the general case.

Fixes: 5337ac4c9b80 ("bpf: Fix the corner case with may_goto and jump to the 1st insn.")
Signed-off-by: Shung-Hsi Yu <shung-hsi.yu@suse.com>
---
 kernel/bpf/verifier.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)
diff mbox series

Patch

diff --git a/kernel/bpf/verifier.c b/kernel/bpf/verifier.c
index c0263fb5ca4b..cf2eb07ddf28 100644
--- a/kernel/bpf/verifier.c
+++ b/kernel/bpf/verifier.c
@@ -18852,7 +18852,7 @@  static int adjust_jmp_off(struct bpf_prog *prog, u32 tgt_idx, u32 delta)
 		} else {
 			if (i + 1 + insn->off != tgt_idx)
 				continue;
-			if (signed_add16_overflows(insn->imm, delta))
+			if (signed_add16_overflows(insn->off, delta))
 				return -ERANGE;
 			insn->off += delta;
 		}