Stack overflow inside XSdPs_Setup32ADMA2DescTbl for large transfers

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Assessment

Difficulty
3/5
Estimated time
1-2 days
Newbie friendliness
45/100
Issue type
Bug
Clarity
Clearly specified
Activity status
Stale
Tech stack
c
Domain
embedded-iot

Research direction

Start in embeddedsw/XilinxProcessorIPLib/drivers/sdps/src/xsdps.c at XSdPs_Setup32ADMA2DescTbl and inspect how TotalDescLines is used with Adma2_DescrTbl[32]. Exercise a large file transfer that produces more than 32 descriptors, then verify that descriptor configuration stays within the table and no adjacent memory is overwritten.

Written by the indexing model from the issue text.

Description

Inside: embeddedsw/XilinxProcessorIPLib/drivers/sdps/src/xsdps.c
Function: XSdPs_Setup32ADMA2DescTbl

For large file transfers, the total number of descriptors to be configured (TotalDescLines) can go past 32, which is how the descriptor table is declared (Adma2_DescrTbl[32]). This causes the descriptor configuration loop to start writing in other memory locations

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