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splice: fix double kunmap() in vmsplice copy path

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The out label should not include the unmap, the only way to jump
there already has unmapped the source.

00002000
       f7c21a00 00000000 00000000 c0489036 00018e32 00000002 00000000
00001000
Call Trace:
 [<c0487dd9>] pipe_to_user+0xca/0xd3
 [<c0488233>] __splice_from_pipe+0x53/0x1bd
 [<c0454947>] ------------[ cut here ]------------
filemap_fault+0x221/0x380
 [<c0487d0f>] pipe_to_user+0x0/0xd3
 [<c0489036>] sys_vmsplice+0x3b7/0x422
 [<c045ec3f>] kernel BUG at mm/highmem.c:206!
handle_mm_fault+0x4d5/0x8eb
 [<c041ed5b>] kmap_atomic+0x1c/0x20
 [<c045d33d>] unmap_vmas+0x3d1/0x584
 [<c045f717>] free_pgtables+0x90/0xa0
 [<c041d84b>] pgd_dtor+0x0/0x1
 [<c044d665>] audit_syscall_exit+0x2aa/0x2c6
 [<c0407817>] do_syscall_trace+0x124/0x169
 [<c0404df2>] syscall_call+0x7/0xb
 =======================
Code: 2d 00 d0 5b 00 25 00 00 e0 ff 29 invalid opcode: 0000 [#1]
c2 89 d0 c1 e8 0c 8b 14 85 a0 6c 7c c0 4a 85 d2 89 14 85 a0 6c 7c c0 74 07
31 c9 4a 75 15 eb 04 <0f> 0b eb fe 31 c9 81 3d 78 38 6d c0 78 38 6d c0 0f
95 c1 b0 01
EIP: [<c045bbc3>] kunmap_high+0x51/0x8e SS:ESP 0068:f5960df0
SMP
Modules linked in: netconsole autofs4 hidp nfs lockd nfs_acl rfcomm l2cap
bluetooth sunrpc ipv6 ib_iser rdma_cm ib_cm iw_cmib_sa ib_mad ib_core
ib_addr iscsi_tcp libiscsi scsi_transport_iscsi dm_mirror dm_multipath
dm_mod video output sbs batteryac parport_pc lp parport sg i2c_piix4
i2c_core floppy cfi_probe gen_probe scb2_flash mtd chipreg tg3 e1000 button
ide_cd serio_raw cdrom aic7xxx scsi_transport_spi sd_mod scsi_mod ext3 jbd
ehci_hcd ohci_hcd uhci_hcd
CPU:    3
EIP:    0060:[<c045bbc3>]    Not tainted VLI
EFLAGS: 00010246   (2.6.23 #1)
EIP is at kunmap_high+0x51/0x8e

Signed-off-by: Jens Axboe <jens.axboe@oracle.com>
This commit is contained in:
Jens Axboe 2007-10-16 10:01:29 +02:00
parent 23c76983e2
commit 6866bef40d
1 changed files with 1 additions and 1 deletions
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2
fs/splice.c
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@ -1390,10 +1390,10 @@ static int pipe_to_user(struct pipe_inode_info *pipe, struct pipe_buffer *buf,
if (copy_to_user(sd->u.userptr, src + buf->offset, sd->len))
ret = -EFAULT;
buf->ops->unmap(pipe, buf, src);
out:
if (ret > 0)
sd->u.userptr += ret;
buf->ops->unmap(pipe, buf, src);
return ret;
}