diff mbox series

bpf-next: Avoid goto in regs_refine_cond_op()

Message ID 20240321002955.808604-1-harishankar.vishwanathan@gmail.com (mailing list archive)
State Accepted
Commit 4c2a26fc80bcb851dc630590f2eec157991eccbf
Delegated to: BPF
Headers show
Series bpf-next: Avoid goto in regs_refine_cond_op() | expand

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bpf/vmtest-bpf-next-PR success PR summary
netdev/series_format warning Single patches do not need cover letters; Target tree name not specified in the subject
netdev/tree_selection success Guessed tree name to be net-next
netdev/ynl success Generated files up to date; no warnings/errors; no diff in generated;
netdev/fixes_present success Fixes tag not required for -next series
netdev/header_inline success No static functions without inline keyword in header files
netdev/build_32bit success Errors and warnings before: 951 this patch: 951
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netdev/verify_fixes success No Fixes tag
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Commit Message

Harishankar Vishwanathan March 21, 2024, 12:29 a.m. UTC 
In case of GE/GT/SGE/JST instructions, regs_refine_cond_op()
reuses the logic that does analysis of LE/LT/SLE/SLT instructions.
This commit avoids the use of a goto to perform the reuse.

Signed-off-by: Harishankar Vishwanathan <harishankar.vishwanathan@gmail.com>
---
 kernel/bpf/verifier.c | 22 +++++++++++++---------
 1 file changed, 13 insertions(+), 9 deletions(-)

Comments

patchwork-bot+netdevbpf@kernel.org March 21, 2024, 7 p.m. UTC | #1 
Hello:

This patch was applied to bpf/bpf-next.git (master)
by Andrii Nakryiko <andrii@kernel.org>:

On Wed, 20 Mar 2024 20:29:54 -0400 you wrote:
> In case of GE/GT/SGE/JST instructions, regs_refine_cond_op()
> reuses the logic that does analysis of LE/LT/SLE/SLT instructions.
> This commit avoids the use of a goto to perform the reuse.
> 
> Signed-off-by: Harishankar Vishwanathan <harishankar.vishwanathan@gmail.com>
> ---
>  kernel/bpf/verifier.c | 22 +++++++++++++---------
>  1 file changed, 13 insertions(+), 9 deletions(-)

Here is the summary with links:
  - bpf-next: Avoid goto in regs_refine_cond_op()
    https://git.kernel.org/bpf/bpf-next/c/4c2a26fc80bc

You are awesome, thank you!
diff mbox series

Patch

diff --git a/kernel/bpf/verifier.c b/kernel/bpf/verifier.c
index de7813947981..ca6cacf7b42f 100644
--- a/kernel/bpf/verifier.c
+++ b/kernel/bpf/verifier.c
@@ -14544,7 +14544,19 @@  static void regs_refine_cond_op(struct bpf_reg_state *reg1, struct bpf_reg_state
 	struct tnum t;
 	u64 val;
 
-again:
+	/* In case of GE/GT/SGE/JST, reuse LE/LT/SLE/SLT logic from below */
+	switch (opcode) {
+	case BPF_JGE:
+	case BPF_JGT:
+	case BPF_JSGE:
+	case BPF_JSGT:
+		opcode = flip_opcode(opcode);
+		swap(reg1, reg2);
+		break;
+	default:
+		break;
+	}
+
 	switch (opcode) {
 	case BPF_JEQ:
 		if (is_jmp32) {
@@ -14687,14 +14699,6 @@  static void regs_refine_cond_op(struct bpf_reg_state *reg1, struct bpf_reg_state
 			reg2->smin_value = max(reg1->smin_value + 1, reg2->smin_value);
 		}
 		break;
-	case BPF_JGE:
-	case BPF_JGT:
-	case BPF_JSGE:
-	case BPF_JSGT:
-		/* just reuse LE/LT logic above */
-		opcode = flip_opcode(opcode);
-		swap(reg1, reg2);
-		goto again;
 	default:
 		return;
 	}