6.6-stable review patch. If anyone has any objections, please let me know.
------------------
From: Huai-Yuan Liu <qq810974084@xxxxxxxxx>
[ Upstream commit 5e0bf3e8aec2cbc51123f84b29aaacbd91fc56fa ]
In function lpfc_xcvr_data_show, the memory allocation with kmalloc might
fail, thereby making rdp_context a null pointer. In the following context
and functions that use this pointer, there are dereferencing operations,
leading to null pointer dereference.
To fix this issue, a null pointer check should be added. If it is null,
use scnprintf to notify the user and return len.
Fixes: 479b0917e447 ("scsi: lpfc: Create a sysfs entry called lpfc_xcvr_data for transceiver info")
Signed-off-by: Huai-Yuan Liu <qq810974084@xxxxxxxxx>
Link: https://lore.kernel.org/r/20240621082545.449170-1-qq810974084@xxxxxxxxx
Reviewed-by: Justin Tee <justin.tee@xxxxxxxxxxxx>
Signed-off-by: Martin K. Petersen <martin.petersen@xxxxxxxxxx>
Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx>
---
drivers/scsi/lpfc/lpfc_attr.c | 5 +++++
1 file changed, 5 insertions(+)
diff --git a/drivers/scsi/lpfc/lpfc_attr.c b/drivers/scsi/lpfc/lpfc_attr.c
index 79b45ea5fdb5e..8123062ec2faf 100644
--- a/drivers/scsi/lpfc/lpfc_attr.c
+++ b/drivers/scsi/lpfc/lpfc_attr.c
@@ -1904,6 +1904,11 @@ lpfc_xcvr_data_show(struct device *dev, struct device_attribute *attr,
/* Get transceiver information */
rdp_context = kmalloc(sizeof(*rdp_context), GFP_KERNEL);
+ if (!rdp_context) {
+ len = scnprintf(buf, PAGE_SIZE - len,
+ "SPF info NA: alloc failure\n");
+ return len;
+ }
rc = lpfc_get_sfp_info_wait(phba, rdp_context);
if (rc) {
--
2.43.0
