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acpi: Avoid freeing a device twice 

The current implementation of acpi_dp_write() frees the node after it
has written it.

If the structure contains a ACPI_DP_TYPE_CHILD then a recursive call to
acpi_dp_write() frees the child and then frees it again when returning
from the call. This results in a double free.

Split the implementation into two steps, one that ones and one that
frees. This is easier to understand and fixes the bug.

Note: This likely has no effect in coreboot since it doesn't seem to
have a proper free() implementation. But it might gain one one day.

BUG=none

Signed-off-by: Simon Glass <sjg@chromium.org>
Change-Id: Ife3917af10bc35a3c3eee38d8292f927ef15409d
Reviewed-on: https://review.coreboot.org/c/coreboot/+/42892
Reviewed-by: Patrick Georgi <pgeorgi@google.com>
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
This commit is contained in:
Simon Glass 2020-06-29 16:18:37 -06:00 committed by Patrick Georgi
parent 84b9653b38
commit 8bfa51e4c4
1 changed files with 7 additions and 2 deletions
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9
src/acpi/device.c
View File

@ -770,7 +770,7 @@ static bool acpi_dp_write_properties(struct acpi_dp *prop, const char *uuid)
return false;
}
void acpi_dp_write(struct acpi_dp *table)
static void acpi_dp_write_(struct acpi_dp *table)
{
struct acpi_dp *dp, *prop;
char *dp_count;
@ -826,7 +826,12 @@ void acpi_dp_write(struct acpi_dp *table)
/* Recursively parse children into separate tables */
for (dp = prop; dp; dp = dp->next)
if (dp->type == ACPI_DP_TYPE_CHILD)
acpi_dp_write(dp->child);
acpi_dp_write_(dp->child);
}
void acpi_dp_write(struct acpi_dp *table)
{
acpi_dp_write_(table);
/* Clean up */
acpi_dp_free(table);