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Message-Id: <20220614020707.1099487-14-sashal@kernel.org>
Date: Mon, 13 Jun 2022 22:06:39 -0400
From: Sasha Levin <sashal@...nel.org>
To: linux-kernel@...r.kernel.org, stable@...r.kernel.org
Cc: Sergey Shtylyov <s.shtylyov@....ru>,
Damien Le Moal <damien.lemoal@...nsource.wdc.com>,
Sasha Levin <sashal@...nel.org>, tj@...nel.org,
linux-ide@...r.kernel.org
Subject: [PATCH AUTOSEL 5.15 14/41] ata: libata-core: fix NULL pointer deref in ata_host_alloc_pinfo()
From: Sergey Shtylyov <s.shtylyov@....ru>
[ Upstream commit bf476fe22aa1851bab4728e0c49025a6a0bea307 ]
In an unlikely (and probably wrong?) case that the 'ppi' parameter of
ata_host_alloc_pinfo() points to an array starting with a NULL pointer,
there's going to be a kernel oops as the 'pi' local variable won't get
reassigned from the initial value of NULL. Initialize 'pi' instead to
'&ata_dummy_port_info' to fix the possible kernel oops for good...
Found by Linux Verification Center (linuxtesting.org) with the SVACE static
analysis tool.
Signed-off-by: Sergey Shtylyov <s.shtylyov@....ru>
Signed-off-by: Damien Le Moal <damien.lemoal@...nsource.wdc.com>
Signed-off-by: Sasha Levin <sashal@...nel.org>
---
drivers/ata/libata-core.c | 4 ++--
1 file changed, 2 insertions(+), 2 deletions(-)
diff --git a/drivers/ata/libata-core.c b/drivers/ata/libata-core.c
index a0343b7c9add..413faa9330b2 100644
--- a/drivers/ata/libata-core.c
+++ b/drivers/ata/libata-core.c
@@ -5500,7 +5500,7 @@ struct ata_host *ata_host_alloc_pinfo(struct device *dev,
const struct ata_port_info * const * ppi,
int n_ports)
{
- const struct ata_port_info *pi;
+ const struct ata_port_info *pi = &ata_dummy_port_info;
struct ata_host *host;
int i, j;
@@ -5508,7 +5508,7 @@ struct ata_host *ata_host_alloc_pinfo(struct device *dev,
if (!host)
return NULL;
- for (i = 0, j = 0, pi = NULL; i < host->n_ports; i++) {
+ for (i = 0, j = 0; i < host->n_ports; i++) {
struct ata_port *ap = host->ports[i];
if (ppi[j])
--
2.35.1
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