linux-kernel - [PATCH 5.13 143/223] ACPI: fix NULL pointer dereference

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Date:   Mon, 26 Jul 2021 17:38:55 +0200
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org, Daniel Scally <djrscally@...il.com>,
        Andy Shevchenko <andy.shevchenko@...il.com>,
        Linus Torvalds <torvalds@...ux-foundation.org>,
        Jens Axboe <axboe@...nel.dk>
Subject: [PATCH 5.13 143/223] ACPI: fix NULL pointer dereference

From: Linus Torvalds <torvalds@...ux-foundation.org>

commit fc68f42aa737dc15e7665a4101d4168aadb8e4c4 upstream.

Commit 71f642833284 ("ACPI: utils: Fix reference counting in
for_each_acpi_dev_match()") started doing "acpi_dev_put()" on a pointer
that was possibly NULL.  That fails miserably, because that helper
inline function is not set up to handle that case.

Just make acpi_dev_put() silently accept a NULL pointer, rather than
calling down to put_device() with an invalid offset off that NULL
pointer.

Link: https://lore.kernel.org/lkml/a607c149-6bf6-0fd0-0e31-100378504da2@kernel.dk/
Reported-and-tested-by: Jens Axboe <axboe@...nel.dk>
Tested-by: Daniel Scally <djrscally@...il.com>
Cc: Andy Shevchenko <andy.shevchenko@...il.com>
Signed-off-by: Linus Torvalds <torvalds@...ux-foundation.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
---
 include/acpi/acpi_bus.h |    3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

--- a/include/acpi/acpi_bus.h
+++ b/include/acpi/acpi_bus.h
@@ -711,7 +711,8 @@ static inline struct acpi_device *acpi_d
 
 static inline void acpi_dev_put(struct acpi_device *adev)
 {
-	put_device(&adev->dev);
+	if (adev)
+		put_device(&adev->dev);
 }
 #else	/* CONFIG_ACPI */