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* Mysterious operations in sysimgblt.c and sysimgblt.c
@ 2021-05-14 14:11 Igor Torrente
  0 siblings, 0 replies; only message in thread
From: Igor Torrente @ 2021-05-14 14:11 UTC (permalink / raw)
  To: adaplas, akpm, jsimmons; +Cc: linux-kernel, linux-fbdev, dri-devel

Hello everybody,

I'm Igor, I'm participating in the Linux kernel mentorship program and 
working to fix some bugs found by the syzbot. I'm currently working on 
this bug below:

The bug consists of an out-of-bound access of an vmalloc vector at the 
imageblit function.

At this moment, I'm trying to understand what is happening between the 
IOCTL and the imageblit function. I tried to follow the commit history, 
but even with the entire history, and after reading the code several 
times, I have no clue why some operations are being done. Operations like:

Lines 148 and 177-180:
Lines 251-256:
Line 190:

Anyone know/remember what these operations are doing?

Thanks for your attention,
Igor M. A. Torrente

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2021-05-14 14:11 Mysterious operations in sysimgblt.c and sysimgblt.c Igor Torrente

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