linux-kernel - [PATCH 5.4 100/320] pcmcia: rsrc_nonstatic: Fix a NULL pointer dereference in nonstatic_find_mem

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Date:   Mon, 24 Jan 2022 19:41:24 +0100
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org, Zhou Qingyang <zhou1615@....edu>,
        Dominik Brodowski <linux@...inikbrodowski.net>,
        Sasha Levin <sashal@...nel.org>
Subject: [PATCH 5.4 100/320] pcmcia: rsrc_nonstatic: Fix a NULL pointer dereference in nonstatic_find_mem_region()

From: Zhou Qingyang <zhou1615@....edu>

[ Upstream commit 977d2e7c63c3d04d07ba340b39987742e3241554 ]

In nonstatic_find_mem_region(), pcmcia_make_resource() is assigned to
res and used in pci_bus_alloc_resource(). There a dereference of res
in pci_bus_alloc_resource(), which could lead to a NULL pointer
dereference on failure of pcmcia_make_resource().

Fix this bug by adding a check of res.

This bug was found by a static analyzer. The analysis employs
differential checking to identify inconsistent security operations
(e.g., checks or kfrees) between two code paths and confirms that the
inconsistent operations are not recovered in the current function or
the callers, so they constitute bugs.

Note that, as a bug found by static analysis, it can be a false
positive or hard to trigger. Multiple researchers have cross-reviewed
the bug.

Builds with CONFIG_PCCARD_NONSTATIC=y show no new warnings,
and our static analyzer no longer warns about this code.

Fixes: 49b1153adfe1 ("pcmcia: move all pcmcia_resource_ops providers into one module")
Signed-off-by: Zhou Qingyang <zhou1615@....edu>
Signed-off-by: Dominik Brodowski <linux@...inikbrodowski.net>
Signed-off-by: Sasha Levin <sashal@...nel.org>
---
 drivers/pcmcia/rsrc_nonstatic.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/drivers/pcmcia/rsrc_nonstatic.c b/drivers/pcmcia/rsrc_nonstatic.c
index 03ae998675e87..3a512513cb32f 100644
--- a/drivers/pcmcia/rsrc_nonstatic.c
+++ b/drivers/pcmcia/rsrc_nonstatic.c
@@ -812,6 +812,9 @@ static struct resource *nonstatic_find_mem_region(u_long base, u_long num,
 	unsigned long min, max;
 	int ret, i, j;

+	if (!res)
+		return NULL;
+
 	low = low || !(s->features & SS_CAP_PAGE_REGS);

 	data.mask = align - 1;
-- 
2.34.1