diff options
| author | Jacob Erlbeck <jerlbeck@sysmocom.de> | 2015-02-23 15:10:20 +0100 |
|---|---|---|
| committer | Jacob Erlbeck <jerlbeck@sysmocom.de> | 2015-02-23 15:10:20 +0100 |
| commit | 08fe76a89334ddc4ee906bd30a00d908745b2b7b (patch) | |
| tree | d212ba153787c14d6f9209cd5fbea24da16db20f /tests/tbf/TbfTest.err | |
| parent | 5e9f40d3d9c29446ca1386f2198057fb8a914370 (diff) | |
tbf: Fix dangling m_new_tbf pointer
Currently if a 'new' TBF is freed before the 'old' one (where
old_tbf->m_new_tbf == new_tbf), the old_tbf->m_new_tbf is not cleared
and can be accessed later on. This can lead to inconsistencies or
segmentation faults.
This commit adds m_old_tbf which points back from new_tbf to old_pdf.
m_new_tbf and m_old_tbf are either both set to NULL or one is the
reverse pointer of the other (tbf->m_new_tbf->m_old_tbf == tbf and
tbf->m_old_tbf->m_new_tbf == tbf). It extends set_new_tbf and
tbf_free to update the pointee accordingly.
The TBF test is extended to check this invariant at several places.
Sponsored-by: On-Waves ehf
Diffstat (limited to 'tests/tbf/TbfTest.err')
| -rw-r--r-- | tests/tbf/TbfTest.err | 5 |
1 files changed, 4 insertions, 1 deletions
diff --git a/tests/tbf/TbfTest.err b/tests/tbf/TbfTest.err index 9d9e5f76..ca522ecb 100644 --- a/tests/tbf/TbfTest.err +++ b/tests/tbf/TbfTest.err @@ -72,10 +72,12 @@ Slot Allocation (Algorithm A) for class 45 - Assign downlink TS=4 TBF(TFI=0 TLLI=0x00000000 DIR=DL STATE=WAIT RELEASE) Trigger dowlink assignment on PACCH, because another LLC PDU has arrived in between Send dowlink assignment on PACCH, because TBF(TFI=0 TLLI=0x00000000 DIR=DL STATE=WAIT RELEASE) exists +TBF(TFI=0 TLLI=0x00000000 DIR=DL STATE=WAIT RELEASE) m_new_tbf is already assigned to TBF(TFI=0 TLLI=0x00000000 DIR=DL STATE=WAIT RELEASE), overwriting the old value with TBF(TFI=0 TLLI=0x00000000 DIR=DL STATE=WAIT RELEASE) TBF(TFI=1 TLLI=0x00000000 DIR=DL STATE=NULL) changes state from NULL to ASSIGN TBF(TFI=1 TLLI=0x00000000 DIR=DL STATE=ASSIGN) starting timer 0. DL packet loss of IMSI= / TLLI=0x00000000: 0% TBF(TFI=0 TLLI=0x00000000 DIR=DL STATE=WAIT RELEASE) free +TBF(TFI=0 TLLI=0x00000000 DIR=DL STATE=WAIT RELEASE) New TBF TBF(TFI=0 TLLI=0x00000000 DIR=DL STATE=WAIT RELEASE) still exists, detaching ********** TBF ends here ********** TBF(TFI=1 TLLI=0x00000000 DIR=DL STATE=ASSIGN) free TBF(TFI=1 TLLI=0x00000000 DIR=DL STATE=ASSIGN) stopping timer 0. @@ -137,12 +139,13 @@ Slot Allocation (Algorithm A) for class 45 - Assign downlink TS=4 TBF(TFI=0 TLLI=0x00000000 DIR=DL STATE=WAIT RELEASE) Trigger dowlink assignment on PACCH, because another LLC PDU has arrived in between Send dowlink assignment on PACCH, because TBF(TFI=0 TLLI=0x00000000 DIR=DL STATE=WAIT RELEASE) exists +TBF(TFI=0 TLLI=0x00000000 DIR=DL STATE=WAIT RELEASE) m_new_tbf is already assigned to TBF(TFI=0 TLLI=0x00000000 DIR=DL STATE=WAIT RELEASE), overwriting the old value with TBF(TFI=0 TLLI=0x00000000 DIR=DL STATE=WAIT RELEASE) TBF(TFI=1 TLLI=0x00000000 DIR=DL STATE=NULL) changes state from NULL to ASSIGN TBF(TFI=1 TLLI=0x00000000 DIR=DL STATE=ASSIGN) starting timer 0. TBF(TFI=1 TLLI=0x00000000 DIR=DL STATE=ASSIGN) free TBF(TFI=1 TLLI=0x00000000 DIR=DL STATE=ASSIGN) stopping timer 0. +TBF(TFI=1 TLLI=0x00000000 DIR=DL STATE=ASSIGN) Old TBF TBF(TFI=1 TLLI=0x00000000 DIR=DL STATE=ASSIGN) still exists, detaching ********** TBF ends here ********** -dangling m_new_tbf pointer in dl_tbf (known bug) DL packet loss of IMSI= / TLLI=0x00000000: 0% TBF(TFI=0 TLLI=0x00000000 DIR=DL STATE=WAIT RELEASE) free ********** TBF ends here ********** |