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In bus_dmamap_unload() on ARM, the counters for free_bpages and reserved_bpages
appear to be vulnerable to unprotected read-modify-write operations that result
in accounting that looks like a page leak.
This was noticed on a 2GB quad core i.MX6 system that has more than one device
attached via FTDI based USB serial connection.
Submitted by: John Hein <jcfyecrayz@liamekaens.com>
Differential Revision: https://reviews.freebsd.org/D35553
PR: 264836
Sponsored by: NVIDIA Networking
(cherry picked from commit
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| altera/socfpga | ||
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| arm | ||
| broadcom/bcm2835 | ||
| cloudabi32 | ||
| conf | ||
| freescale | ||
| include | ||
| linux | ||
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| nvidia | ||
| qemu | ||
| rockchip | ||
| ti | ||
| versatile | ||
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