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fs: btrfs: volumes.c: Fix for possible null pointer dereference 

commit 8321cf2596d283821acc466377c2b85bcd3422b7 upstream.

There is otherwise a risk of a possible null pointer dereference.

Was largely found by using a static code analysis program called cppcheck.

Signed-off-by: Rickard Strandqvist <rickard_strandqvist@spectrumdigital.se>
Signed-off-by: Chris Mason <clm@fb.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Rickard Strandqvist 2014-05-22 22:43:43 +02:00 committed by Greg Kroah-Hartman
parent 70510742ba
commit 2346e1e345
1 changed files with 3 additions and 2 deletions
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5
fs/btrfs/volumes.c
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@ -1628,11 +1628,12 @@ int btrfs_rm_device(struct btrfs_root *root, char *device_path)
struct btrfs_fs_devices *fs_devices;
fs_devices = root->fs_info->fs_devices;
while (fs_devices) {
if (fs_devices->seed == cur_devices)
if (fs_devices->seed == cur_devices) {
fs_devices->seed = cur_devices->seed;
break;
}
fs_devices = fs_devices->seed;
}
fs_devices->seed = cur_devices->seed;
cur_devices->seed = NULL;
lock_chunks(root);
__btrfs_close_devices(cur_devices);