| commit | 3762465d4a6c6a92a93d361b95dd453fd736ba73 | |
| author | Federico Vaga <federico.vaga@gmail.com> | |
| Sat, 29 Oct 2011 07:45:39 +0000 (29 09:45 +0200) | ||
| committer | Greg Kroah-Hartman <gregkh@suse.de> | |
| Fri, 9 Dec 2011 16:54:42 +0000 (9 08:54 -0800) | ||
| tree | 949323bc7c567cd834f528345e44bb1b53efa02b | treesnapshot (tar.gz zip) |
| parent | 7994d8747d9ac088be8a2136dc25ea30135ca1e8 | commitdiff |
Staging: comedi: fix mmap_count
commit df30b21cb0eed5ba8a8e0cdfeebc66ba8cde821d upstream.
In comedi_fops, mmap_count is decremented at comedi_vm_ops->close but
it is not incremented at comedi_vm_ops->open. This may result in a negative
counter. The patch introduces the open method to keep the counter
consistent.
The bug was triggerd by this sample code:
mmap(0, ...., comedi_fd);
fork();
exit(0);
Acked-by: Alessandro Rubini <rubini@gnudd.com>
Signed-off-by: Federico Vaga <federico.vaga@gmail.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
commit df30b21cb0eed5ba8a8e0cdfeebc66ba8cde821d upstream.
In comedi_fops, mmap_count is decremented at comedi_vm_ops->close but
it is not incremented at comedi_vm_ops->open. This may result in a negative
counter. The patch introduces the open method to keep the counter
consistent.
The bug was triggerd by this sample code:
mmap(0, ...., comedi_fd);
fork();
exit(0);
Acked-by: Alessandro Rubini <rubini@gnudd.com>
Signed-off-by: Federico Vaga <federico.vaga@gmail.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
| drivers/staging/comedi/comedi_fops.c | diffblobblamehistory |