This is a note to let you know that I've just added the patch titled
kernfs: add back missing error check in kernfs_fop_mmap()
to my driver-core git tree which can be found at
git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/driver-core.git
in the driver-core-linus branch.
The patch will show up in the next release of the linux-next tree
(usually sometime within the next 24 hours during the week.)
The patch will hopefully also be merged in Linus's tree for the
next -rc kernel release.
If you have any questions about this process, please let me know.
>From b44b2140265ddfde03acbe809336111d31adb0d1 Mon Sep 17 00:00:00 2001
From: Tejun Heo <tj@xxxxxxxxxx>
Date: Sun, 20 Apr 2014 08:29:21 -0400
Subject: kernfs: add back missing error check in kernfs_fop_mmap()
While updating how mmap enabled kernfs files are handled by lockdep,
9b2db6e18945 ("sysfs: bail early from kernfs_file_mmap() to avoid
spurious lockdep warning") inadvertently dropped error return check
from kernfs_file_mmap(). The intention was just dropping "if
(ops->mmap)" check as the control won't reach the point if the mmap
callback isn't implemented, but I mistakenly removed the error return
check together with it.
This led to Xorg crash on i810 which was reported and bisected to the
commit and then to the specific change by Tobias.
Signed-off-by: Tejun Heo <tj@xxxxxxxxxx>
Reported-and-bisected-by: Tobias Powalowski <tobias.powalowski@xxxxxxxxxxxxxx>
Tested-by: Tobias Powalowski <tobias.powalowski@xxxxxxxxxxxxxx>
References: http://lkml.kernel.org/g/533D01BD.1010200@xxxxxxxxxxxxxx
Cc: stable <stable@xxxxxxxxxxxxxxx> # 3.14
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
fs/kernfs/file.c | 2 ++
1 file changed, 2 insertions(+)
diff --git a/fs/kernfs/file.c b/fs/kernfs/file.c
index 8034706a7af8..e01ea4a14a01 100644
--- a/fs/kernfs/file.c
+++ b/fs/kernfs/file.c
@@ -484,6 +484,8 @@ static int kernfs_fop_mmap(struct file *file, struct vm_area_struct *vma)
ops = kernfs_ops(of->kn);
rc = ops->mmap(of, vma);
+ if (rc)
+ goto out_put;
/*
* PowerPC's pci_mmap of legacy_mem uses shmem_zero_setup()
--
1.9.0
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