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Btrfs: Make sure dir is non-null before doing S_ISGID checks

The S_ISGID check in btrfs_new_inode caused an oops during subvol creationbecause sometimes the dir is null.Signed-off-by: Chris Mason <chris.mason@oracle.com>

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fs/btrfs
- inode.c

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`‎fs/btrfs/inode.c‎`

Lines changed: 1 addition & 1 deletion

Original file line number	Diff line number	Diff line change
`@@ -3491,7 +3491,7 @@ static struct inode btrfs_new_inode(struct btrfs_trans_handle trans,`
`3491`	`3491`
`3492`	`3492`	`inode->i_uid=current_fsuid();`
`3493`	`3493`
`3494`		`-if (dir->i_mode&S_ISGID) {`
	`3494`	`+if (dir&& (dir->i_mode&S_ISGID)) {`
`3495`	`3495`	`inode->i_gid=dir->i_gid;`
`3496`	`3496`	`if (S_ISDIR(mode))`
`3497`	`3497`	`mode \|=S_ISGID;`

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Commit42f15d7

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`‎fs/btrfs/inode.c‎`

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