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net: fujitsu: fix potential null-ptr-deref

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[ Upstream commit 52202be1cd ]

In fmvj18x_get_hwinfo(), if ioremap fails there will be NULL pointer
deref. To fix this, check the return value of ioremap and return -1
to the caller in case of failure.

Cc: "David S. Miller" <davem@davemloft.net>
Acked-by: Dominik Brodowski <linux@dominikbrodowski.net>
Signed-off-by: Anirudh Rayabharam <mail@anirudhrb.com>
Link: https://lore.kernel.org/r/20210503115736.2104747-16-gregkh@linuxfoundation.org
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>
This commit is contained in:
Anirudh Rayabharam 2021-05-03 13:56:42 +02:00 • committed by Greg Kroah-Hartman
commit 71723a796a
1 changed files with 5 additions and 0 deletions
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5
drivers/net/ethernet/fujitsu/fmvj18x_cs.c
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@ -547,6 +547,11 @@ static int fmvj18x_get_hwinfo(struct pcmcia_device *link, u_char *node_id)
return -1;
base = ioremap(link->resource[2]->start, resource_size(link->resource[2]));
if (!base) {
pcmcia_release_window(link, link->resource[2]);
return -1;
}
pcmcia_map_mem_page(link, link->resource[2], 0);
/*