In the Linux kernel, the following vulnerability has been resolved: dma-buf: Fix silent overflow for phys vec to sgt In case MMIO size is

In the Linux kernel, the following vulnerability has been resolved:

dma-buf: Fix silent overflow for phys vec to sgt

In case MMIO size is bigger than 4G and peer2peer DMA goes
through host bridge, we trigger a code path that assigns the
total linked IOVA (which is greater than 4G) to mapped_len.

Previously, mapped_len was declared as 32-bit unsigned int.
When accumulating size_t lengths, this leads to a silent wrap-around.
This truncation causes truncated lengths to be passed to functions
like fill_sg_entry().

Fix this by changing mapped_len to size_t (64-bit). While
at it, fix similar potential overflow issues in calc_sg_nents
by using check_add_overflow() for nents and using
unsigned int for the loop iterator in fill_sg_entry to match.