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 <[email protected]>
Signed-off-by: T.J. Mercier <[email protected]>
---
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
