[PATCH v2] staging: rtl8723bs: os_dep: avoid NULL pointer dereference in rtw_cbuf_alloc

[Shyam Sunder Reddy Padira <shyamsunderreddypadira@gmail.com>]

The return value of kzalloc_flex() is used without
ensuring that the allocation succeeded, and the
pointer is dereferenced unconditionally.

Guard the access to the allocated structure to
avoid a potential NULL pointer dereference if the
allocation fails.

Fixes: 980cd426a25747daf8ed25e2a1904b2d26ffbb3d ("staging: rtl8723bs: replace rtw_zmalloc() with kzalloc()")

Signed-off-by: Shyam Sunder Reddy Padira <shyamsunderreddypadira@gmail.com>
---
changes in v2:
-Fixed spelling mistakes(dereference, potential)
-Added Fixes tag
---
 drivers/staging/rtl8723bs/os_dep/osdep_service.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/drivers/staging/rtl8723bs/os_dep/osdep_service.c b/drivers/staging/rtl8723bs/os_dep/osdep_service.c
index 7959daeabc6f..4cfdf7c62344 100644
--- a/drivers/staging/rtl8723bs/os_dep/osdep_service.c
+++ b/drivers/staging/rtl8723bs/os_dep/osdep_service.c
@@ -194,7 +194,8 @@ struct rtw_cbuf *rtw_cbuf_alloc(u32 size)
 	struct rtw_cbuf *cbuf;
 
 	cbuf = kzalloc_flex(*cbuf, bufs, size);
-	cbuf->size = size;
+	if (cbuf)
+		cbuf->size = size;
 
 	return cbuf;
 }
-- 
2.43.0