5.4-stable review patch. If anyone has any objections, please let me know.
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From: Denis Arefev arefev@swemel.ru
commit 6c683c6887e4addcd6bd1ddce08cafccb0a21e32 upstream.
The value returned by acpi_evaluate_integer() is not checked, but the result is not always successful, so it is necessary to add a check of the returned value.
If the result remains negative during three iterations of the loop, then the uninitialized variable 'val' will be used in the clamp_val() macro, so it must be initialized with the current value of the 'curr' variable.
In this case, the algorithm should be less noisy.
Found by Linux Verification Center (linuxtesting.org) with SVACE.
Fixes: b23910c2194e ("asus-laptop: Pegatron Lucid accelerometer") Cc: stable@vger.kernel.org Signed-off-by: Denis Arefev arefev@swemel.ru Link: https://lore.kernel.org/r/20250403122603.18172-1-arefev@swemel.ru Reviewed-by: Ilpo Järvinen ilpo.jarvinen@linux.intel.com Signed-off-by: Ilpo Järvinen ilpo.jarvinen@linux.intel.com Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.org --- drivers/platform/x86/asus-laptop.c | 9 ++++++--- 1 file changed, 6 insertions(+), 3 deletions(-)
--- a/drivers/platform/x86/asus-laptop.c +++ b/drivers/platform/x86/asus-laptop.c @@ -428,11 +428,14 @@ static int asus_pega_lucid_set(struct as
static int pega_acc_axis(struct asus_laptop *asus, int curr, char *method) { + unsigned long long val = (unsigned long long)curr; + acpi_status status; int i, delta; - unsigned long long val; - for (i = 0; i < PEGA_ACC_RETRIES; i++) { - acpi_evaluate_integer(asus->handle, method, NULL, &val);
+ for (i = 0; i < PEGA_ACC_RETRIES; i++) { + status = acpi_evaluate_integer(asus->handle, method, NULL, &val); + if (ACPI_FAILURE(status)) + continue; /* The output is noisy. From reading the ASL * dissassembly, timeout errors are returned with 1's * in the high word, and the lack of locking around