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udf: fix an uninitialized read bug and remove dead code 

In udf_lookup(), the pointer 'fi' is a local variable initialized by the
return value of the function call udf_find_entry(). However, if the macro
'UDF_RECOVERY' is defined, this variable will become uninitialized if the
else branch is not taken, which can potentially cause incorrect results in
the following execution.

To fix this issue, this patch drops the whole code in the ifdef
'UDF_RECOVERY' region, as it is dead code.

Signed-off-by: Wenwen Wang <wang6495@umn.edu>
Signed-off-by: Jan Kara <jack@suse.cz>
This commit is contained in:
Wenwen Wang 2019-04-15 12:58:06 -05:00 committed by Jan Kara
parent 5d552ad796
commit 39416c5872
1 changed files with 0 additions and 15 deletions
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15
fs/udf/namei.c
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@ -304,21 +304,6 @@ static struct dentry *udf_lookup(struct inode *dir, struct dentry *dentry,
if (dentry->d_name.len > UDF_NAME_LEN)
return ERR_PTR(-ENAMETOOLONG);
#ifdef UDF_RECOVERY
/* temporary shorthand for specifying files by inode number */
if (!strncmp(dentry->d_name.name, ".B=", 3)) {
struct kernel_lb_addr lb = {
.logicalBlockNum = 0,
.partitionReferenceNum =
simple_strtoul(dentry->d_name.name + 3,
NULL, 0),
};
inode = udf_iget(dir->i_sb, lb);
if (IS_ERR(inode))
return inode;
} else
#endif /* UDF_RECOVERY */
fi = udf_find_entry(dir, &dentry->d_name, &fibh, &cfi);
if (IS_ERR(fi))
return ERR_CAST(fi);