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ACPI: fix NULL pointer dereference

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[ Upstream commit fc68f42aa737dc15e7665a4101d4168aadb8e4c4 ]

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/[email protected]/
Reported-and-tested-by: Jens Axboe <[email protected]>
Tested-by: Daniel Scally <[email protected]>
Cc: Andy Shevchenko <[email protected]>
Signed-off-by: Linus Torvalds <[email protected]>
Signed-off-by: Sasha Levin <[email protected]>
This commit is contained in:
Linus Torvalds 2021-07-24 15:25:54 -07:00 • committed by Greg Kroah-Hartman
commit 38f54217b4
1 changed files with 2 additions and 1 deletions
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3
include/acpi/acpi_bus.h
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@ -681,7 +681,8 @@ acpi_dev_get_first_match_dev(const char *hid, const char *uid, s64 hrv);
static inline void acpi_dev_put(struct acpi_device *adev)
{
put_device(&adev->dev);
if (adev)
put_device(&adev->dev);
}
#else /* CONFIG_ACPI */