netdev - [PATCH iproute2 v2 1/2] bpf: Fix segfault when custom pinning is used

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Date:   Wed, 22 Apr 2020 06:28:07 -0400
From:   Jamal Hadi Salim <jhs@...atatu.com>
To:     stephen@...workplumber.org
Cc:     netdev@...r.kernel.org, dsahern@...il.com, aclaudi@...hat.com,
        daniel@...earbox.net, asmadeus@...ewreck.org,
        Jamal Hadi Salim <hadi@...atatu.com>,
        Jamal Hadi Salim <jhs@...atatu.com>
Subject: [PATCH iproute2 v2 1/2] bpf: Fix segfault when custom pinning is used

From: Jamal Hadi Salim <hadi@...atatu.com>

Fixes: c0325b06382 ("bpf: replace snprintf with asprintf when dealing with long buffers")

Signed-off-by: Jamal Hadi Salim <jhs@...atatu.com>
---
 lib/bpf.c | 9 ++++-----
 1 file changed, 4 insertions(+), 5 deletions(-)

diff --git a/lib/bpf.c b/lib/bpf.c
index 10cf9bf4..656cad02 100644
--- a/lib/bpf.c
+++ b/lib/bpf.c
@@ -1509,15 +1509,15 @@ out:
 static int bpf_make_custom_path(const struct bpf_elf_ctx *ctx,
 				const char *todo)
 {
-	char *tmp = NULL;
+	char tmp[PATH_MAX] = {};
 	char *rem = NULL;
 	char *sub;
 	int ret;
 
-	ret = asprintf(&tmp, "%s/../", bpf_get_work_dir(ctx->type));
+	ret = snprintf(tmp, PATH_MAX, "%s/../", bpf_get_work_dir(ctx->type));
 	if (ret < 0) {
-		fprintf(stderr, "asprintf failed: %s\n", strerror(errno));
-		goto out;
+		fprintf(stderr, "snprintf failed: %s\n", strerror(errno));
+		return ret;
 	}
 
 	ret = asprintf(&rem, "%s/", todo);
@@ -1547,7 +1547,6 @@ static int bpf_make_custom_path(const struct bpf_elf_ctx *ctx,
 	ret = 0;
 out:
 	free(rem);
-	free(tmp);
 	return ret;
 }
 
-- 
2.20.1