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ovl: expand warning in ovl_d_real() 

There was a syzbot report with this warning but insufficient information...

Signed-off-by: Miklos Szeredi <mszeredi@redhat.com>
This commit is contained in:
Miklos Szeredi 2020-11-12 11:31:55 +01:00
parent 13c6ad0f45
commit cef4cbff06
1 changed files with 8 additions and 5 deletions
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13
fs/overlayfs/super.c
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@ -79,7 +79,7 @@ static void ovl_dentry_release(struct dentry *dentry)
static struct dentry *ovl_d_real(struct dentry *dentry,
const struct inode *inode)
{
struct dentry *real;
struct dentry *real = NULL, *lower;
/* It's an overlay file */
if (inode && d_inode(dentry) == inode)
@ -98,9 +98,10 @@ static struct dentry *ovl_d_real(struct dentry *dentry,
if (real && !inode && ovl_has_upperdata(d_inode(dentry)))
return real;
real = ovl_dentry_lowerdata(dentry);
if (!real)
lower = ovl_dentry_lowerdata(dentry);
if (!lower)
goto bug;
real = lower;
/* Handle recursion */
real = d_real(real, inode);
@ -108,8 +109,10 @@ static struct dentry *ovl_d_real(struct dentry *dentry,
if (!inode || inode == d_inode(real))
return real;
bug:
WARN(1, "ovl_d_real(%pd4, %s:%lu): real dentry not found\n", dentry,
inode ? inode->i_sb->s_id : "NULL", inode ? inode->i_ino : 0);
WARN(1, "%s(%pd4, %s:%lu): real dentry (%p/%lu) not found\n",
__func__, dentry, inode ? inode->i_sb->s_id : "NULL",
inode ? inode->i_ino : 0, real,
real && d_inode(real) ? d_inode(real)->i_ino : 0);
return dentry;
}