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Event Groups: snapshot xEventGroupSetBits returning value while in vTaskSuspendAll (#1143)

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Event Groups: snapshot xEventGroupSetBits returning value while in
vTaskSuspendAll. Fixes uxEventBits dereference after event group
deleted by higher priority thread.
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あく 2024-09-11 18:37:08 +01:00 committed by GitHub
parent d806240dfe
commit d3052f1f50
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GPG key ID: B5690EEEBB952194
2 changed files with 11 additions and 11 deletions
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9
event_groups.c
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@ -551,7 +551,7 @@
ListItem_t * pxNext; ListItem_t * pxNext;
ListItem_t const * pxListEnd; ListItem_t const * pxListEnd;
List_t const * pxList; List_t const * pxList;
EventBits_t uxBitsToClear = 0, uxBitsWaitedFor, uxControlBits; EventBits_t uxBitsToClear = 0, uxBitsWaitedFor, uxControlBits, uxReturnBits;
EventGroup_t * pxEventBits = xEventGroup; EventGroup_t * pxEventBits = xEventGroup;
BaseType_t xMatchFound = pdFALSE; BaseType_t xMatchFound = pdFALSE;
@ -635,12 +635,15 @@
/* Clear any bits that matched when the eventCLEAR_EVENTS_ON_EXIT_BIT /* Clear any bits that matched when the eventCLEAR_EVENTS_ON_EXIT_BIT
* bit was set in the control word. */ * bit was set in the control word. */
pxEventBits->uxEventBits &= ~uxBitsToClear; pxEventBits->uxEventBits &= ~uxBitsToClear;
/* Snapshot resulting bits. */
uxReturnBits = pxEventBits->uxEventBits;
} }
( void ) xTaskResumeAll(); ( void ) xTaskResumeAll();
traceRETURN_xEventGroupSetBits( pxEventBits->uxEventBits ); traceRETURN_xEventGroupSetBits( uxReturnBits );
return pxEventBits->uxEventBits; return uxReturnBits;
} }
/*-----------------------------------------------------------*/ /*-----------------------------------------------------------*/

13
include/event_groups.h
View file

@ -483,14 +483,11 @@ EventBits_t xEventGroupClearBits( EventGroupHandle_t xEventGroup,
* and bit 0 set uxBitsToSet to 0x09. * and bit 0 set uxBitsToSet to 0x09.
* *
* @return The value of the event group at the time the call to * @return The value of the event group at the time the call to
* xEventGroupSetBits() returns. There are two reasons why the returned value * xEventGroupSetBits() returns. Returned value might have the bits specified
* might have the bits specified by the uxBitsToSet parameter cleared. First, * by the uxBitsToSet parameter cleared if setting a bit results in a task
* if setting a bit results in a task that was waiting for the bit leaving the * that was waiting for the bit leaving the blocked state then it is possible
* blocked state then it is possible the bit will be cleared automatically * the bit will be cleared automatically (see the xClearBitOnExit parameter
* (see the xClearBitOnExit parameter of xEventGroupWaitBits()). Second, any * of xEventGroupWaitBits()).
* unblocked (or otherwise Ready state) task that has a priority above that of
* the task that called xEventGroupSetBits() will execute and may change the
* event group value before the call to xEventGroupSetBits() returns.
* *
* Example usage: * Example usage:
* @code{c} * @code{c}