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authorJan Kara <jack@suse.cz>2017-07-18 12:27:56 +0200
committerJan Kara <jack@suse.cz>2017-07-18 12:33:16 +0200
commit34363c057b368114d8b93376ec6b65ef5f36a55b (patch)
tree7108d5e9650581495e1733188f453cec9711aa71 /fs
parentfcea8aed91f53b51f9b943dc01f12d8aa666c720 (diff)
downloadlinux-stericsson-34363c057b368114d8b93376ec6b65ef5f36a55b.tar.gz
isofs: Fix off-by-one in 'session' mount option parsing
According to ECMA-130 standard maximum valid track number is 99. Since 'session' mount option starts indexing at 0 (and we add 1 to the passed number), we should refuse value 99. Also the condition in isofs_get_last_session() unnecessarily repeats the check - remove it. Reported-by: David Howells <dhowells@redhat.com> Signed-off-by: Jan Kara <jack@suse.cz>
Diffstat (limited to 'fs')
-rw-r--r--fs/isofs/inode.c8
1 files changed, 6 insertions, 2 deletions
diff --git a/fs/isofs/inode.c b/fs/isofs/inode.c
index 8cf898a59730..217a5e7815da 100644
--- a/fs/isofs/inode.c
+++ b/fs/isofs/inode.c
@@ -410,7 +410,11 @@ static int parse_options(char *options, struct iso9660_options *popt)
if (match_int(&args[0], &option))
return 0;
n = option;
- if (n > 99)
+ /*
+ * Track numbers are supposed to be in range 1-99, the
+ * mount option starts indexing at 0.
+ */
+ if (n >= 99)
return 0;
popt->session = n + 1;
break;
@@ -543,7 +547,7 @@ static unsigned int isofs_get_last_session(struct super_block *sb, s32 session)
vol_desc_start=0;
ms_info.addr_format=CDROM_LBA;
- if(session >= 0 && session <= 99) {
+ if (session > 0) {
struct cdrom_tocentry Te;
Te.cdte_track=session;
Te.cdte_format=CDROM_LBA;