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ACPICA: Avoid null pointer dereference on Op. 

ACPICA commit 08a00639b0d6756e8ba1421419fc3728904651d9

The calls to acpi_os_acquire_object can result in a null being assigned
to Op (for example if a mutex acquire fails) which can lead to a
null pointer dereference on Op on the call to ASL_CV_TRANSFER_COMMENTS
(via function cv_transfer_comments). Move the block into the previous
block that checks for a null Op so that we never can call
cv_transfer_comments with a null Op.

Detected by: coverity_scan CID#1371660 ("Dereference after null check")

Link: https://github.com/acpica/acpica/commit/08a00639
Signed-off-by: Colin Ian King <colin.king@canonical.com>
Signed-off-by: Bob Moore <robert.moore@intel.com>
Signed-off-by: Erik Schmauss <erik.schmauss@intel.com>
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
This commit is contained in:
Colin Ian King 2017-11-17 15:40:17 -08:00 committed by Rafael J. Wysocki
parent ee470f08b0
commit 29ad1f88ab
1 changed files with 3 additions and 3 deletions
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6
drivers/acpi/acpica/psutils.c
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@ -158,10 +158,10 @@ union acpi_parse_object *acpi_ps_alloc_op(u16 opcode, u8 *aml)
if (opcode == AML_SCOPE_OP) {
acpi_gbl_current_scope = op;
}
}
if (gbl_capture_comments) {
ASL_CV_TRANSFER_COMMENTS(op);
if (gbl_capture_comments) {
ASL_CV_TRANSFER_COMMENTS(op);
}
}
return (op);