* [PATCH] mci: fix NULL pointer dereference
@ 2025-04-30 12:11 Michael Tretter
0 siblings, 0 replies; only message in thread
From: Michael Tretter @ 2025-04-30 12:11 UTC (permalink / raw)
To: barebox; +Cc: Michael Tretter
Calling `devlookup -k` directly on an mmc device instead of an partition
causes a NULL pointer dereference for cdevm.
Return a NULL pointer in this case to signal the error.
Signed-off-by: Michael Tretter <m.tretter@pengutronix.de>
---
drivers/mci/mci-core.c | 3 +++
1 file changed, 3 insertions(+)
diff --git a/drivers/mci/mci-core.c b/drivers/mci/mci-core.c
index 592543faa7b8..abcda497646d 100644
--- a/drivers/mci/mci-core.c
+++ b/drivers/mci/mci-core.c
@@ -2536,6 +2536,9 @@ static char *mci_get_linux_mmcblkdev(struct block_device *blk,
if (mci_part->area_type != MMC_BLK_DATA_AREA_MAIN)
return NULL;
+ if (!cdevm)
+ return NULL;
+
id = of_alias_get_id(cdev_of_node(cdevm), "mmc");
if (id < 0)
return NULL;
--
2.39.5
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