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ACPI: fix NULL pointer dereference 

Commit 71f6428332 ("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@kernel.dk>
Tested-by: Daniel Scally <djrscally@gmail.com>
Cc: Andy Shevchenko <andy.shevchenko@gmail.com>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Linus Torvalds 2021-07-24 15:25:54 -07:00
parent 7ffca2bb9d
commit fc68f42aa7
1 changed files with 2 additions and 1 deletions
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3
include/acpi/acpi_bus.h
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@ -720,7 +720,8 @@ static inline struct acpi_device *acpi_dev_get(struct acpi_device *adev)
static inline void acpi_dev_put(struct acpi_device *adev)
{
put_device(&adev->dev);
if (adev)
put_device(&adev->dev);
}
struct acpi_device *acpi_bus_get_acpi_device(acpi_handle handle);