If FAT length == 0, the image doesn't have any data. And it can be the
cause of overlapping the root dir and FAT entries.
Also Windows treats it as invalid format.
Reported-by: [email protected]
Signed-off-by: OGAWA Hirofumi <[email protected]>
---
fs/fat/inode.c | 6 ++++++
1 file changed, 6 insertions(+)
diff --git a/fs/fat/inode.c b/fs/fat/inode.c
index 71946da..bf8e04e 100644
--- a/fs/fat/inode.c 2020-04-07 21:55:27.001147223 +0900
+++ b/fs/fat/inode.c 2020-04-07 22:06:15.164098069 +0900
@@ -1520,6 +1520,12 @@ static int fat_read_bpb(struct super_blo
goto out;
}
+ if (bpb->fat_fat_length == 0 && bpb->fat32_length == 0) {
+ if (!silent)
+ fat_msg(sb, KERN_ERR, "bogus number of FAT sectors");
+ goto out;
+ }
+
error = 0;
out:
_
OGAWA Hirofumi <[email protected]> writes: