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libbpf: fix memory leak in attach_tp for target-less tracepoint program

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Fix sec_name memory leak if user defines target-less SEC("tp").

Fixes: 9af8efc45eb1 ("libbpf: Allow "incomplete" basic tracing SEC() definitions")
Signed-off-by: Andrii Nakryiko <andrii@kernel.org>
Acked-by: David Vernet <void@manifault.com>
Link: https://lore.kernel.org/r/20220516184547.3204674-1-andrii@kernel.org
Signed-off-by: Alexei Starovoitov <ast@kernel.org>
This commit is contained in:
Andrii Nakryiko
2022-05-16 11:45:47 -07:00
committed by Andrii Nakryiko
parent 12e932ac0e
commit d43fc5a42f
1 changed files with 4 additions and 4 deletions
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8
src/libbpf.c
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@@ -11592,16 +11592,16 @@ static int attach_tp(const struct bpf_program *prog, long cookie, struct bpf_lin
{ {
char *sec_name, *tp_cat, *tp_name; char *sec_name, *tp_cat, *tp_name;
sec_name = strdup(prog->sec_name);
if (!sec_name)
return -ENOMEM;
*link = NULL; *link = NULL;
/* no auto-attach for SEC("tp") or SEC("tracepoint") */ /* no auto-attach for SEC("tp") or SEC("tracepoint") */
if (strcmp(prog->sec_name, "tp") == 0 || strcmp(prog->sec_name, "tracepoint") == 0) if (strcmp(prog->sec_name, "tp") == 0 || strcmp(prog->sec_name, "tracepoint") == 0)
return 0; return 0;
sec_name = strdup(prog->sec_name);
if (!sec_name)
return -ENOMEM;
/* extract "tp/<category>/<name>" or "tracepoint/<category>/<name>" */ /* extract "tp/<category>/<name>" or "tracepoint/<category>/<name>" */
if (str_has_pfx(prog->sec_name, "tp/")) if (str_has_pfx(prog->sec_name, "tp/"))
tp_cat = sec_name + sizeof("tp/") - 1; tp_cat = sec_name + sizeof("tp/") - 1;