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

sicong
2024-05-13T14:35:21Z

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@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