[PATCH bpf] selftests/bpf: Fix OOB read in dmabuf_collector

["T.J. Mercier" <tjmercier@google.com>]

Dmabuf name allocations can be less than DMA_BUF_NAME_LEN characters,
but bpf_probe_read_kernel always tries to read exactly that many bytes.
If a name is less than DMA_BUF_NAME_LEN characters,
bpf_probe_read_kernel will read past the end. bpf_probe_read_kernel_str
stops at the first NUL terminator so use it instead, like
iter_dmabuf_for_each already does.

Fixes: ae5d2c59ecd7 ("selftests/bpf: Add test for dmabuf_iter")
Reported-by: Sukadev Bhattiprolu <quic_sukadev@quicinc.com>
Signed-off-by: T.J. Mercier <tjmercier@google.com>
---
 tools/testing/selftests/bpf/progs/dmabuf_iter.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/tools/testing/selftests/bpf/progs/dmabuf_iter.c b/tools/testing/selftests/bpf/progs/dmabuf_iter.c
index 13cdb11fdeb2..9cbb7442646e 100644
--- a/tools/testing/selftests/bpf/progs/dmabuf_iter.c
+++ b/tools/testing/selftests/bpf/progs/dmabuf_iter.c
@@ -48,7 +48,7 @@ int dmabuf_collector(struct bpf_iter__dmabuf *ctx)
 
 	/* Buffers are not required to be named */
 	if (pname) {
-		if (bpf_probe_read_kernel(name, sizeof(name), pname))
+		if (bpf_probe_read_kernel_str(name, sizeof(name), pname) < 0)
 			return 1;
 
 		/* Name strings can be provided by userspace */
-- 
2.53.0.414.gf7e9f6c205-goog