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libbpf-tools: ksnoop: Fix two invalid access to map value #5361

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Merged
yonghong-song merged 1 commit into from
Jul 13, 2025
Merged

libbpf-tools: ksnoop: Fix two invalid access to map value #5361

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5 changes: 3 additions & 2 deletions libbpf-tools/ksnoop.bpf.c
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Original file line number Diff line number Diff line change
Expand Up @@ -103,7 +103,8 @@ static struct trace *get_trace(struct pt_regs *ctx, bool entry)
/* get address of last function we called */
if (last_stack_depth >= 0 &&
last_stack_depth < FUNC_MAX_STACK_DEPTH)
last_ip = func_stack->ips[last_stack_depth];
bpf_probe_read_kernel(&last_ip, sizeof(last_ip),
&func_stack->ips[last_stack_depth]);
/* push ip onto stack. return will pop it. */
func_stack->ips[stack_depth] = ip;
/* mask used in case bounds checks are optimized out */
Expand Down Expand Up @@ -202,7 +203,7 @@ static struct trace *get_trace(struct pt_regs *ctx, bool entry)

static void output_trace(struct pt_regs *ctx, struct trace *trace)
{
__u16 trace_len;
__u64 trace_len;

if (trace->buf_len == 0)
goto skip;
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