[PATCH 1/2] rsxx: Fix potential NULL dereference setting up debugfs

[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]

 



The "card->gendisk" pointer is allocated in rsxx_setup_dev() but there
is a module option "enable_blkdev" which lets people disable the block
device.  In that situation the "card->gendisk" pointer is NULL and it
would lead to a NULL dereference here.

Fixes: 36f988e978f8 ("rsxx: Adding in debugfs entries.")
Signed-off-by: Dan Carpenter <dan.carpenter@xxxxxxxxxx>
---
This patch is from static analysis.  The patch is obviously harmless.
So far as I can tell, the bug is real.  But maybe a different solution
is prefered?

 drivers/block/rsxx/core.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/drivers/block/rsxx/core.c b/drivers/block/rsxx/core.c
index 10f6368117d81..6207449fa716f 100644
--- a/drivers/block/rsxx/core.c
+++ b/drivers/block/rsxx/core.c
@@ -228,6 +228,9 @@ static void rsxx_debugfs_dev_new(struct rsxx_cardinfo *card)
 	struct dentry *debugfs_pci_regs;
 	struct dentry *debugfs_cram;
 
+	if (!card->gendisk)
+		return;
+
 	card->debugfs_dir = debugfs_create_dir(card->gendisk->disk_name, NULL);
 	if (IS_ERR_OR_NULL(card->debugfs_dir))
 		goto failed_debugfs_dir;
-- 
2.26.2




[Index of Archives]     [Kernel Development]     [Kernel Announce]     [Kernel Newbies]     [Linux Networking Development]     [Share Photos]     [IDE]     [Security]     [Git]     [Netfilter]     [Yosemite News]     [MIPS Linux]     [ARM Linux]     [Device Mapper]

  Powered by Linux