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authorJan Kara <jack@suse.cz>2020-09-25 14:53:08 +0200
committerJan Kara <jack@suse.cz>2020-09-29 17:21:54 +0200
commit44ac6b829c4e173fdf6df18e6dd86aecf9a3dc99 (patch)
tree5711c4004045db65ec3e194c3c462b0d02daedff /fs/udf/super.c
parent382a2287bf9cd283206764572f66ab12657218aa (diff)
udf: Limit sparing table size
Although UDF standard allows it, we don't support sparing table larger than a single block. Check it during mount so that we don't try to access memory beyond end of buffer. Reported-by: syzbot+9991561e714f597095da@syzkaller.appspotmail.com Signed-off-by: Jan Kara <jack@suse.cz>
Diffstat (limited to 'fs/udf/super.c')
-rw-r--r--fs/udf/super.c6
1 files changed, 6 insertions, 0 deletions
diff --git a/fs/udf/super.c b/fs/udf/super.c
index 413a50599d1c..faf2017ada11 100644
--- a/fs/udf/super.c
+++ b/fs/udf/super.c
@@ -1345,6 +1345,12 @@ static int udf_load_sparable_map(struct super_block *sb,
(int)spm->numSparingTables);
return -EIO;
}
+ if (le32_to_cpu(spm->sizeSparingTable) > sb->s_blocksize) {
+ udf_err(sb, "error loading logical volume descriptor: "
+ "Too big sparing table size (%u)\n",
+ le32_to_cpu(spm->sizeSparingTable));
+ return -EIO;
+ }
for (i = 0; i < spm->numSparingTables; i++) {
loc = le32_to_cpu(spm->locSparingTable[i]);