[PATCH 4.5 12/88] ata: ahci_xgene: dereferencing uninitialized pointer in probe

From: Greg Kroah-Hartman
Date: Mon May 09 2016 - 03:25:01 EST


4.5-stable review patch. If anyone has any objections, please let me know.

------------------

From: Dan Carpenter <dan.carpenter@xxxxxxxxxx>

commit 8134233e8d346aaa1c929dc510e75482ae318bce upstream.

If the call to acpi_get_object_info() fails then "info" hasn't been
initialized. In that situation, we already know that "version" should
be XGENE_AHCI_V1 so we don't actually need to dereference "info".

Fixes: c9802a4be661 ('ata: ahci_xgene: Add AHCI Support for 2nd HW version of APM X-Gene SoC AHCI SATA Host controller.')
Signed-off-by: Dan Carpenter <dan.carpenter@xxxxxxxxxx>
Signed-off-by: Tejun Heo <tj@xxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>

---
drivers/ata/ahci_xgene.c | 4 ++--
1 file changed, 2 insertions(+), 2 deletions(-)

--- a/drivers/ata/ahci_xgene.c
+++ b/drivers/ata/ahci_xgene.c
@@ -821,9 +821,9 @@ static int xgene_ahci_probe(struct platf
dev_warn(&pdev->dev, "%s: Error reading device info. Assume version1\n",
__func__);
version = XGENE_AHCI_V1;
- }
- if (info->valid & ACPI_VALID_CID)
+ } else if (info->valid & ACPI_VALID_CID) {
version = XGENE_AHCI_V2;
+ }
}
}
#endif