From: David Daney Date: Tue, 7 May 2013 17:11:16 +0000 (+0000) Subject: MIPS: Make virt_to_phys() work for all unmapped addresses. X-Git-Tag: v3.10-rc2~10^2~4 X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=49c426ba445f83d304a5eab3d49efa123329cf2b;p=pandora-kernel.git MIPS: Make virt_to_phys() work for all unmapped addresses. As reported: This problem was discovered when doing BGP traffic with the TCP MD5 option activated, where the following call chain caused a crash: * tcp_v4_rcv * tcp_v4_timewait_ack * tcp_v4_send_ack -> follow stack variable rep.th * tcp_v4_md5_hash_hdr * tcp_md5_hash_header * sg_init_one * sg_set_buf * virt_to_page I noticed that tcp_v4_send_reset uses a similar stack variable and also calls tcp_v4_md5_hash_hdr, so it has the same problem. The networking core can indirectly call virt_to_phys() on stack addresses, if this is done from PID 0, the stack will usually be in CKSEG0, so virt_to_phys() needs to work there as well Signed-off-by: David Daney Cc: linux-mips@linux-mips.org Cc: Jiang Liu Cc: eunb.song@samsung.com Cc: linux-kernel@vger.kernel.org Patchwork: https://patchwork.linux-mips.org/patch/5220/ Signed-off-by: Ralf Baechle --- Reading git-diff-tree failed