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heap: Fix regression in `heap_caps_add_region` API related to address range checks 

Regression was introduced in 32408b718f, which disallowed
addition of heap region with following condition:

`new_start < start && new_end == start`

This caused issues in Bluetooth APIs `esp_bt_mem_release` or `esp_bt_controller_mem_release`.

This commit fixes the problem and also adds API documentation for supported memory address
ranges in heap add region APIs.
pull/8755/head
Mahavir Jain 2022-03-24 12:25:37 +05:30
rodzic 8ce997f02c
commit f13e25d156
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ID klucza GPG: 99324EF4A00734E0
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41
components/heap/heap_caps_init.c
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@ -162,15 +162,8 @@ esp_err_t heap_caps_add_region(intptr_t start, intptr_t end)
return ESP_ERR_NOT_FOUND;
}
esp_err_t heap_caps_add_region_with_caps(const uint32_t caps[], intptr_t start, intptr_t end)
bool heap_caps_check_add_region_allowed(intptr_t heap_start, intptr_t heap_end, intptr_t start, intptr_t end)
{
esp_err_t err = ESP_FAIL;
if (caps == NULL || start == 0 || end == 0 || end <= start) {
return ESP_ERR_INVALID_ARG;
}
//Check if region overlaps the start and/or end of an existing region. If so, the
//region is invalid (or maybe added twice)
/*
* We assume that in any region, the "start" must be stictly less than the end.
* Specially, the 3rd scenario can be allowed. For example, allocate memory from heap,
@ -183,27 +176,39 @@ esp_err_t heap_caps_add_region_with_caps(const uint32_t caps[], intptr_t start,
* the existing heap region s(tart) e(nd)
* |----------------------|
*
* 1.add region (e1<s) |-----| correct: bool condition_1 = end < heap->start;
* 1.add region (e1<s) |-----| correct: bool condition_1 = end < heap_start;
*
* 2.add region (s2<s && e2>=s) |-----------------| wrong: bool condition_2 = start < heap->start && end >= heap->start;
* 2.add region (s2<s && e2>s) |-----------------| wrong: bool condition_2 = start < heap_start && end > heap_start;
* |---------------------------------| wrong
*
* 3.add region (s3>=s && e3<e) |---------------| correct: bool condition_3 = start >= heap->start && end < heap->end;
* 3.add region (s3>=s && e3<e) |---------------| correct: bool condition_3 = start >= heap_start && end < heap_end;
* |--------------| correct
*
* 4.add region (s4<e && e4>=e) |----------------------| wrong: bool condition_4 = start < heap->end && end >= heap->end;
* 4.add region (s4<e && e4>e) |------------------------| wrong: bool condition_4 = start < heap_end && end > heap_end;
* |---------------------| wrong
*
* 5.add region (s5>=e) |----| correct: bool condition_5 = start >= heap->end;
* 5.add region (s5>=e) |----| correct: bool condition_5 = start >= heap_end;
*/
bool condition_2 = start < heap_start && end > heap_start; // if true then region not allowed
bool condition_4 = start < heap_end && end > heap_end; // if true then region not allowed
return (condition_2 || condition_4) ? false: true;
}
esp_err_t heap_caps_add_region_with_caps(const uint32_t caps[], intptr_t start, intptr_t end)
{
esp_err_t err = ESP_FAIL;
if (caps == NULL || start == 0 || end == 0 || end <= start) {
return ESP_ERR_INVALID_ARG;
}
//Check if region overlaps the start and/or end of an existing region. If so, the
//region is invalid (or maybe added twice)
heap_t *heap;
SLIST_FOREACH(heap, &registered_heaps, next) {
bool condition_2 = start < heap->start && end >= heap->start; //if 1, wrong
bool condition_4 = start < heap->end && end >= heap->end; //if 1, wrong
bool wrong_region = condition_2 || condition_4;
if (wrong_region) {
if (!heap_caps_check_add_region_allowed(heap->start, heap->end, start, end)) {
ESP_EARLY_LOGD(TAG, "invalid overlap detected with existing heap region");
return ESP_FAIL;
}
}

28
components/heap/include/esp_heap_caps_init.h
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@ -49,6 +49,20 @@ void heap_caps_enable_nonos_stack_heaps(void);
*
* Use heap_caps_add_region_with_caps() to register a region with custom capabilities.
*
* @note Please refer to following example for memory regions allowed for addition to heap based on an existing region
* (address range for demonstration purpose only):
@verbatim
Existing region: 0x1000 <-> 0x3000
New region: 0x1000 <-> 0x3000 (Allowed)
New region: 0x1000 <-> 0x2000 (Allowed)
New region: 0x0000 <-> 0x1000 (Allowed)
New region: 0x3000 <-> 0x4000 (Allowed)
New region: 0x0000 <-> 0x2000 (NOT Allowed)
New region: 0x0000 <-> 0x4000 (NOT Allowed)
New region: 0x1000 <-> 0x4000 (NOT Allowed)
New region: 0x2000 <-> 0x4000 (NOT Allowed)
@endverbatim
*
* @param start Start address of new region.
* @param end End address of new region.
*
@ -63,6 +77,20 @@ esp_err_t heap_caps_add_region(intptr_t start, intptr_t end);
*
* Similar to heap_caps_add_region(), only custom memory capabilities are specified by the caller.
*
* @note Please refer to following example for memory regions allowed for addition to heap based on an existing region
* (address range for demonstration purpose only):
@verbatim
Existing region: 0x1000 <-> 0x3000
New region: 0x1000 <-> 0x3000 (Allowed)
New region: 0x1000 <-> 0x2000 (Allowed)
New region: 0x0000 <-> 0x1000 (Allowed)
New region: 0x3000 <-> 0x4000 (Allowed)
New region: 0x0000 <-> 0x2000 (NOT Allowed)
New region: 0x0000 <-> 0x4000 (NOT Allowed)
New region: 0x1000 <-> 0x4000 (NOT Allowed)
New region: 0x2000 <-> 0x4000 (NOT Allowed)
@endverbatim
*
* @param caps Ordered array of capability masks for the new region, in order of priority. Must have length
* SOC_MEMORY_TYPE_NO_PRIOS. Does not need to remain valid after the call returns.
* @param start Start address of new region.