netdev - [PATCH bpf] tools: bpf: fix NULL return handling in bpf__prepare

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Message-ID: <20180511112142.23324-1-yuehaibing@huawei.com>
Date:   Fri, 11 May 2018 19:21:42 +0800
From:   YueHaibing <yuehaibing@...wei.com>
To:     <alexander.shishkin@...ux.intel.com>, <mingo@...hat.com>,
        <peterz@...radead.org>
CC:     <netdev@...r.kernel.org>, <namhyung@...nel.org>,
        YueHaibing <yuehaibing@...wei.com>
Subject: [PATCH bpf] tools: bpf: fix NULL return handling in bpf__prepare_load

bpf_object__open()/bpf_object__open_buffer can return error pointer or NULL,
check the return values with IS_ERR_OR_NULL() in bpf__prepare_load and
bpf__prepare_load_buffer

Signed-off-by: YueHaibing <yuehaibing@...wei.com>
---
 tools/perf/util/bpf-loader.c | 6 +++---
 1 file changed, 3 insertions(+), 3 deletions(-)

diff --git a/tools/perf/util/bpf-loader.c b/tools/perf/util/bpf-loader.c
index af7ad81..cee6587 100644
--- a/tools/perf/util/bpf-loader.c
+++ b/tools/perf/util/bpf-loader.c
@@ -66,7 +66,7 @@ bpf__prepare_load_buffer(void *obj_buf, size_t obj_buf_sz, const char *name)
 	}
 
 	obj = bpf_object__open_buffer(obj_buf, obj_buf_sz, name);
-	if (IS_ERR(obj)) {
+	if (IS_ERR_OR_NULL(obj)) {
 		pr_debug("bpf: failed to load buffer\n");
 		return ERR_PTR(-EINVAL);
 	}
@@ -102,14 +102,14 @@ struct bpf_object *bpf__prepare_load(const char *filename, bool source)
 			pr_debug("bpf: successfull builtin compilation\n");
 		obj = bpf_object__open_buffer(obj_buf, obj_buf_sz, filename);
 
-		if (!IS_ERR(obj) && llvm_param.dump_obj)
+		if (!IS_ERR_OR_NULL(obj) && llvm_param.dump_obj)
 			llvm__dump_obj(filename, obj_buf, obj_buf_sz);
 
 		free(obj_buf);
 	} else
 		obj = bpf_object__open(filename);
 
-	if (IS_ERR(obj)) {
+	if (IS_ERR_OR_NULL(obj)) {
 		pr_debug("bpf: failed to load %s\n", filename);
 		return obj;
 	}
-- 
2.7.0