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pcmcia: Fix a NULL pointer dereference in __iodyn_find_io_region()

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commit 44822df89e upstream.

In __iodyn_find_io_region(), pcmcia_make_resource() is assigned to
res and used in pci_bus_alloc_resource(). There is 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.

Cc: stable@vger.kernel.org
Fixes: 49b1153adf ("pcmcia: move all pcmcia_resource_ops providers into one module")
Signed-off-by: Ma Ke <make24@iscas.ac.cn>
Signed-off-by: Dominik Brodowski <linux@dominikbrodowski.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Ma Ke 2025-08-12 15:25:09 +08:00 committed by Greg Kroah-Hartman
parent ec1b3e6d52
commit b990c8c6ff
1 changed files with 3 additions and 0 deletions
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3
drivers/pcmcia/rsrc_iodyn.c
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@ -62,6 +62,9 @@ static struct resource *__iodyn_find_io_region(struct pcmcia_socket *s,
unsigned long min = base;
int ret;
if (!res)
return NULL;
data.mask = align - 1;
data.offset = base & data.mask;