Module Name: xsrc
Committed By: rin
Date: Tue Jul 23 12:01:53 UTC 2019
Modified Files:
xsrc/external/mit/xf86-video-wsfb/dist/src: wsfb_driver.c
Log Message:
Correctly support the case of fbi->fbi_fboffset != 0, which means base
address of framebuffer is not page-aligned:
- When mmap framebuffer, fbi->fbi_fboffset is added to the length of
framebuffer. Otherwise, the last page of framebuffer is not mapped
properly if (size of framebuffer) <= (page boundary) < (size of
framebuffer + fbi->fbi_fboffset), since length of mapped area is
counted from page-truncated address. This results in memory
corruption in the upper adjacent page, or SEGV.
- Use fPtr->fbstart (real base address of framebuffer) instead of
fPtr->fbmem (return value of mmap, i.e., page-aligned base address)
where appropriate.
Tested on genfb(4) on Cubietruck, where fbi->fbi_fboffset = 4096.
No functional changes for majority of framebuffer drivers, whose base
address is page-aligned.
To generate a diff of this commit:
cvs rdiff -u -r1.34 -r1.35 \
xsrc/external/mit/xf86-video-wsfb/dist/src/wsfb_driver.c
Please note that diffs are not public domain; they are subject to the
copyright notices on the relevant files.
