linux-kernel - [PATCH v3 2/7] firmware: coreboot: Unmap ioregion on failure

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Message-Id: <20180809171722.144325-3-swboyd@chromium.org>
Date:   Thu,  9 Aug 2018 10:17:17 -0700
From:   Stephen Boyd <swboyd@...omium.org>
To:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Cc:     linux-kernel@...r.kernel.org,
        Wei-Ning Huang <wnhuang@...omium.org>,
        Julius Werner <jwerner@...omium.org>,
        Brian Norris <briannorris@...omium.org>,
        Samuel Holland <samuel@...lland.org>
Subject: [PATCH v3 2/7] firmware: coreboot: Unmap ioregion on failure

Both callers of coreboot_table_init() ioremap the pointer that comes in
but they don't unmap the memory on failure. Both of them also fail probe
immediately with the return value of coreboot_table_init(), leaking a
mapping when it fails. Plug the leak so the mapping isn't left unused.

Cc: Wei-Ning Huang <wnhuang@...omium.org>
Cc: Julius Werner <jwerner@...omium.org>
Cc: Brian Norris <briannorris@...omium.org>
Cc: Samuel Holland <samuel@...lland.org>
Fixes: 570d30c2823f ("firmware: coreboot: Expose the coreboot table as a bus")
Signed-off-by: Stephen Boyd <swboyd@...omium.org>
---
 drivers/firmware/google/coreboot_table.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/drivers/firmware/google/coreboot_table.c b/drivers/firmware/google/coreboot_table.c
index 19db5709ae28..0d3e140444ae 100644
--- a/drivers/firmware/google/coreboot_table.c
+++ b/drivers/firmware/google/coreboot_table.c
@@ -138,6 +138,9 @@ int coreboot_table_init(struct device *dev, void __iomem *ptr)
 		ptr_entry += entry.size;
 	}
 
+	if (ret)
+		iounmap(ptr);
+
 	return ret;
 }
 EXPORT_SYMBOL(coreboot_table_init);
-- 
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