]> pilppa.com Git - linux-2.6-omap-h63xx.git/commit
[PATCH] skip data conversion in compat_sys_mount when data_page is NULL
authorAndrey Mirkin <amirkin@openvz.org>
Thu, 7 Dec 2006 04:31:35 +0000 (20:31 -0800)
committerLinus Torvalds <torvalds@woody.osdl.org>
Thu, 7 Dec 2006 16:39:20 +0000 (08:39 -0800)
commit822191a2fa1584a29c3224ab328507adcaeac1ab
tree833b6e7d88fc49bf430826db26f75b4877593a15
parenta1e85378ba50694cf8f27b190c7e16d7c8dad276
[PATCH] skip data conversion in compat_sys_mount when data_page is NULL

OpenVZ Linux kernel team has found a problem with mounting in compat mode.

Simple command "mount -t smbfs ..." on Fedora Core 5 distro in 32-bit mode
leads to oops:

  Unable to handle kernel NULL pointer dereference at 0000000000000000 RIP: compat_sys_mount+0xd6/0x290
  Process mount (pid: 14656, veid=300, threadinfo ffff810034d30000, task ffff810034c86bc0)
  Call Trace: ia32_sysret+0x0/0xa

The problem is that data_page pointer can be NULL, so we should skip data
conversion in this case.

Signed-off-by: Andrey Mirkin <amirkin@openvz.org>
Cc: <stable@kernel.org>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
fs/compat.c