diff mbox series

[bpf-next,3/4] selftests/bpf: Add a null pointer check for the load_btf_spec

Message ID 20240424020444.2375773-4-chentao@kylinos.cn (mailing list archive)
State Changes Requested
Delegated to: BPF
Headers show
Series Add some 'malloc' failure checks | expand

Checks

Context Check Description
netdev/series_format success Posting correctly formatted
netdev/tree_selection success Clearly marked for bpf-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: 8 this patch: 8
netdev/build_tools success Errors and warnings before: 0 this patch: 0
netdev/cc_maintainers success CCed 16 of 16 maintainers
netdev/build_clang success Errors and warnings before: 8 this patch: 8
netdev/verify_signedoff success Signed-off-by tag matches author and committer
netdev/deprecated_api success None detected
netdev/check_selftest success No net selftest shell script
netdev/verify_fixes success No Fixes tag
netdev/build_allmodconfig_warn success Errors and warnings before: 8 this patch: 8
netdev/checkpatch success total: 0 errors, 0 warnings, 0 checks, 8 lines checked
netdev/build_clang_rust success No Rust files in patch. Skipping build
netdev/kdoc success Errors and warnings before: 0 this patch: 0
netdev/source_inline success Was 0 now: 0
bpf/vmtest-bpf-next-PR success PR summary
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Commit Message

Kunwu April 24, 2024, 2:04 a.m. UTC 
There is a 'malloc' call, which can be unsuccessful.
Add the malloc failure checking to avoid possible null
dereference.

Signed-off-by: Kunwu Chan <chentao@kylinos.cn>
---
 tools/testing/selftests/bpf/test_verifier.c | 2 ++
 1 file changed, 2 insertions(+)

Comments

Markus Elfring April 24, 2024, 10:40 a.m. UTC | #1 
…
> Add the malloc failure checking to avoid possible null
> dereference.
…

How do you think about the following wording variant?

   Add a return value check so that a null pointer dereference will be avoided
   after a memory allocation failure.


Would you like to add the tag “Fixes” accordingly?


…
> +++ b/tools/testing/selftests/bpf/test_verifier.c
> @@ -762,6 +762,8 @@ static int load_btf_spec(__u32 *types, int types_len,
>  	);
>
>  	raw_btf = malloc(sizeof(hdr) + types_len + strings_len);
> +	if (!raw_btf)
> +		return -ENOMEM;
…

How do you think about to reuse the variable “errno” in such an error case?

Regards,
Markus
diff mbox series

Patch

diff --git a/tools/testing/selftests/bpf/test_verifier.c b/tools/testing/selftests/bpf/test_verifier.c
index df04bda1c927..9c80b2943418 100644
--- a/tools/testing/selftests/bpf/test_verifier.c
+++ b/tools/testing/selftests/bpf/test_verifier.c
@@ -762,6 +762,8 @@  static int load_btf_spec(__u32 *types, int types_len,
 	);
 
 	raw_btf = malloc(sizeof(hdr) + types_len + strings_len);
+	if (!raw_btf)
+		return -ENOMEM;
 
 	ptr = raw_btf;
 	memcpy(ptr, &hdr, sizeof(hdr));