[PATCH 3.4 071/176] udf: Verify i_size when loading inode

[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]

 



From: Jan Kara <jack@xxxxxxx>

3.4.107-rc1 review patch.  If anyone has any objections, please let me know.

------------------


commit e159332b9af4b04d882dbcfe1bb0117f0a6d4b58 upstream.

Verify that inode size is sane when loading inode with data stored in
ICB. Otherwise we may get confused later when working with the inode and
inode size is too big.

Reported-by: Carl Henrik Lunde <chlunde@xxxxxxxxxxx>
Signed-off-by: Jan Kara <jack@xxxxxxx>
[lizf: Backported to 3.4: just return on error, as there's no "out" label]
Signed-off-by: Zefan Li <lizefan@xxxxxxxxxx>
---
 fs/udf/inode.c | 14 ++++++++++++++
 1 file changed, 14 insertions(+)

diff --git a/fs/udf/inode.c b/fs/udf/inode.c
index aa70035..8053ee7 100644
--- a/fs/udf/inode.c
+++ b/fs/udf/inode.c
@@ -1392,6 +1392,20 @@ static void udf_fill_inode(struct inode *inode, struct buffer_head *bh)
 							iinfo->i_lenEAttr;
 	}
 
+	/* Sanity checks for files in ICB so that we don't get confused later */
+	if (iinfo->i_alloc_type == ICBTAG_FLAG_AD_IN_ICB) {
+		/*
+		 * For file in ICB data is stored in allocation descriptor
+		 * so sizes should match
+		 */
+		if (iinfo->i_lenAlloc != inode->i_size)
+			return;
+		/* File in ICB has to fit in there... */
+		if (inode->i_size > inode->i_sb->s_blocksize -
+					udf_file_entry_alloc_offset(inode))
+			return;
+	}
+
 	switch (fe->icbTag.fileType) {
 	case ICBTAG_FILE_TYPE_DIRECTORY:
 		inode->i_op = &udf_dir_inode_operations;
-- 
1.9.1

--
To unsubscribe from this list: send the line "unsubscribe stable" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at  http://vger.kernel.org/majordomo-info.html




[Index of Archives]     [Linux Kernel]     [Kernel Development Newbies]     [Linux USB Devel]     [Video for Linux]     [Linux Audio Users]     [Yosemite Hiking]     [Linux Kernel]     [Linux SCSI]