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authorRussell King <rmk+kernel@armlinux.org.uk>2019-12-09 11:09:04 +0000
committerAl Viro <viro@zeniv.linux.org.uk>2020-01-20 20:12:40 -0500
commitf93793fd73a629f4c86b0d91fd84fe175705aff9 (patch)
treeb4187bc69a3b276b928a379197f75d0961b8e015 /fs/adfs
parentf6f14a0d71b0773a1d4147d1a3c33d537cd213ab (diff)
downloadlinux-f93793fd73a629f4c86b0d91fd84fe175705aff9.tar.bz2
fs/adfs: map: fix map scanning
When scanning the map for a fragment id, we need to keep track of the free space links, so we don't inadvertently believe that the freespace link is a valid fragment id. Signed-off-by: Russell King <rmk+kernel@armlinux.org.uk> Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
Diffstat (limited to 'fs/adfs')
-rw-r--r--fs/adfs/map.c9
1 files changed, 7 insertions, 2 deletions
diff --git a/fs/adfs/map.c b/fs/adfs/map.c
index 82e1bf101fe6..a81de80c45c1 100644
--- a/fs/adfs/map.c
+++ b/fs/adfs/map.c
@@ -72,9 +72,12 @@ static int lookup_zone(const struct adfs_discmap *dm, const unsigned int idlen,
const u32 idmask = (1 << idlen) - 1;
unsigned char *map = dm->dm_bh->b_data;
unsigned int start = dm->dm_startbit;
- unsigned int fragend;
+ unsigned int freelink, fragend;
u32 frag;
+ frag = GET_FRAG_ID(map, 8, idmask & 0x7fff);
+ freelink = frag ? 8 + frag : 0;
+
do {
frag = GET_FRAG_ID(map, start, idmask);
@@ -82,7 +85,9 @@ static int lookup_zone(const struct adfs_discmap *dm, const unsigned int idlen,
if (fragend >= endbit)
goto error;
- if (frag == frag_id) {
+ if (start == freelink) {
+ freelink += frag & 0x7fff;
+ } else if (frag == frag_id) {
unsigned int length = fragend + 1 - start;
if (*offset < length)