dma_map_sgtable internally uses the dma_map_sg_attrs helper. The problem is
that dma_map_sg_attrs returns the number of entries mapped, whereas
dma_map_sgtable returns nonzero on failure. This leads to dma_map_sgtable
returning non-zero-but-positive values which tricks other areas of the stack
into thinking nents is a valid pointer.
This checks if nents is valid and returns zero if so, updating the nents field
in sgt. This fixes PRIME render offload with nvidia-drm.
Fixes:
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freebsd32 | ||
ia32 | ||
lindebugfs | ||
linprocfs | ||
linsysfs | ||
linux | ||
linuxkpi | ||
x86bios |