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fs/adfs: super: limit idlen according to directory type

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Limit idlen according to the directory type, as idlen (the size of a
fragment ID) can not be more than 16 with the "new directory" layout.

Signed-off-by: Russell King <rmk+kernel@armlinux.org.uk>
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
This commit is contained in:
Russell King 2019-06-04 14:50:19 +01:00 committed by Al Viro
parent 5808b14a1f
commit 8616108de1
1 changed files with 8 additions and 2 deletions
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10
fs/adfs/super.c
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@ -54,6 +54,7 @@ void adfs_msg(struct super_block *sb, const char *pfx, const char *fmt, ...)
static int adfs_checkdiscrecord(struct adfs_discrecord *dr)
{
unsigned int max_idlen;
int i;
/* sector size must be 256, 512 or 1024 bytes */
@ -73,8 +74,13 @@ static int adfs_checkdiscrecord(struct adfs_discrecord *dr)
if (le32_to_cpu(dr->disc_size_high) >> dr->log2secsize)
return 1;
/* idlen must be no greater than 19 v2 [1.0] */
if (dr->idlen > 19)
/*
* Maximum idlen is limited to 16 bits for new directories by
* the three-byte storage of an indirect disc address. For
* big directories, idlen must be no greater than 19 v2 [1.0]
*/
max_idlen = dr->format_version ? 19 : 16;
if (dr->idlen > max_idlen)
return 1;
/* reserved bytes should be zero */