[PATCH v1] wifi: mt76: mt7615: fix null pointer dereference bug

[sicong]

Function mt7615_coredump_work will call vzalloc to allocate a large amount
of memory space, the size of which is 1300KB. There should be a null
pointer check after vzalloc. Otherwise, when the memory allocation fails
and returns NULL, the function will cause kernel crash.

Fixes: de791098459d ("wifi: mt76: mt7615: fix null pointer dereference bug")
Signed-off-by: Sicong Huang <congei42 at 163.com>
---
 drivers/net/wireless/mediatek/mt76/mt7615/mac.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/drivers/net/wireless/mediatek/mt76/mt7615/mac.c b/drivers/net/wireless/mediatek/mt76/mt7615/mac.c
index 7ba789834e8d..04eb52904520 100644
--- a/drivers/net/wireless/mediatek/mt76/mt7615/mac.c
+++ b/drivers/net/wireless/mediatek/mt76/mt7615/mac.c
@@ -2341,6 +2341,9 @@ void mt7615_coredump_work(struct work_struct *work)
 	}
 
 	dump = vzalloc(MT76_CONNAC_COREDUMP_SZ);
+	if(!dump)
+		return;
+
 	data = dump;
 
 	while (true) {
-- 
2.34.1