UDF: check for allocated memory for inode data
This patch adds checking for granted memory while filling up inode data to
prevent possible NULL pointer usage. If there is not enough memory to fill
inode data we just mark it as "bad". Also some whitespace cleanup.
Signed-off-by: Cyrill Gorcunov <gorcunov@gmail.com>
Cc: Jan Kara <jack@ucw.cz>
Cc: Christoph Hellwig <hch@lst.de>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
diff --git a/fs/udf/inode.c b/fs/udf/inode.c
index bf7de0b..5b82e48 100644
--- a/fs/udf/inode.c
+++ b/fs/udf/inode.c
@@ -49,6 +49,7 @@
static mode_t udf_convert_permissions(struct fileEntry *);
static int udf_update_inode(struct inode *, int);
static void udf_fill_inode(struct inode *, struct buffer_head *);
+static int udf_alloc_i_data(struct inode *inode, size_t size);
static struct buffer_head *inode_getblk(struct inode *, sector_t, int *,
long *, int *);
static int8_t udf_insert_aext(struct inode *, struct extent_position,
@@ -734,7 +735,7 @@
(*c) ++;
(*endnum) ++;
}
-
+
laarr[curr].extLocation.logicalBlockNum = newblocknum;
if (etype == (EXT_NOT_RECORDED_NOT_ALLOCATED >> 30))
laarr[curr].extLocation.partitionReferenceNum =
@@ -836,7 +837,7 @@
{
numalloc -= elen;
if (*endnum > (i+1))
- memmove(&laarr[i], &laarr[i+1],
+ memmove(&laarr[i], &laarr[i+1],
sizeof(long_ad) * (*endnum - (i+1)));
i --;
(*endnum) --;
@@ -1024,7 +1025,7 @@
{
block_truncate_page(inode->i_mapping, inode->i_size, udf_get_block);
udf_truncate_extents(inode);
- }
+ }
inode->i_mtime = inode->i_ctime = current_fs_time(inode->i_sb);
if (IS_SYNC(inode))
@@ -1087,10 +1088,10 @@
{
kernel_lb_addr loc;
ie = (struct indirectEntry *)ibh->b_data;
-
+
loc = lelb_to_cpu(ie->indirectICB.extLocation);
-
- if (ie->indirectICB.extLength &&
+
+ if (ie->indirectICB.extLength &&
(nbh = udf_read_ptagged(inode->i_sb, loc, 0, &ident)))
{
if (ident == TAG_IDENT_FE ||
@@ -1156,14 +1157,22 @@
{
UDF_I_EFE(inode) = 1;
UDF_I_USE(inode) = 0;
- UDF_I_DATA(inode) = kmalloc(inode->i_sb->s_blocksize - sizeof(struct extendedFileEntry), GFP_KERNEL);
+ if (udf_alloc_i_data(inode, inode->i_sb->s_blocksize - sizeof(struct extendedFileEntry)))
+ {
+ make_bad_inode(inode);
+ return;
+ }
memcpy(UDF_I_DATA(inode), bh->b_data + sizeof(struct extendedFileEntry), inode->i_sb->s_blocksize - sizeof(struct extendedFileEntry));
}
else if (le16_to_cpu(fe->descTag.tagIdent) == TAG_IDENT_FE)
{
UDF_I_EFE(inode) = 0;
UDF_I_USE(inode) = 0;
- UDF_I_DATA(inode) = kmalloc(inode->i_sb->s_blocksize - sizeof(struct fileEntry), GFP_KERNEL);
+ if (udf_alloc_i_data(inode, inode->i_sb->s_blocksize - sizeof(struct fileEntry)))
+ {
+ make_bad_inode(inode);
+ return;
+ }
memcpy(UDF_I_DATA(inode), bh->b_data + sizeof(struct fileEntry), inode->i_sb->s_blocksize - sizeof(struct fileEntry));
}
else if (le16_to_cpu(fe->descTag.tagIdent) == TAG_IDENT_USE)
@@ -1173,7 +1182,11 @@
UDF_I_LENALLOC(inode) =
le32_to_cpu(
((struct unallocSpaceEntry *)bh->b_data)->lengthAllocDescs);
- UDF_I_DATA(inode) = kmalloc(inode->i_sb->s_blocksize - sizeof(struct unallocSpaceEntry), GFP_KERNEL);
+ if (udf_alloc_i_data(inode, inode->i_sb->s_blocksize - sizeof(struct unallocSpaceEntry)))
+ {
+ make_bad_inode(inode);
+ return;
+ }
memcpy(UDF_I_DATA(inode), bh->b_data + sizeof(struct unallocSpaceEntry), inode->i_sb->s_blocksize - sizeof(struct unallocSpaceEntry));
return;
}
@@ -1191,7 +1204,7 @@
inode->i_nlink = le16_to_cpu(fe->fileLinkCount);
if (!inode->i_nlink)
inode->i_nlink = 1;
-
+
inode->i_size = le64_to_cpu(fe->informationLength);
UDF_I_LENEXTENTS(inode) = inode->i_size;
@@ -1243,7 +1256,7 @@
}
else
{
- inode->i_blocks = le64_to_cpu(efe->logicalBlocksRecorded) <<
+ inode->i_blocks = le64_to_cpu(efe->logicalBlocksRecorded) <<
(inode->i_sb->s_blocksize_bits - 9);
if ( udf_stamp_to_time(&convtime, &convtime_usec,
@@ -1374,6 +1387,20 @@
}
}
+static int udf_alloc_i_data(struct inode *inode, size_t size)
+{
+ UDF_I_DATA(inode) = kmalloc(size, GFP_KERNEL);
+
+ if (!UDF_I_DATA(inode))
+ {
+ printk(KERN_ERR "udf:udf_alloc_i_data (ino %ld) no free memory\n",
+ inode->i_ino);
+ return -ENOMEM;
+ }
+
+ return 0;
+}
+
static mode_t
udf_convert_permissions(struct fileEntry *fe)
{
@@ -2072,7 +2099,7 @@
mark_buffer_dirty_inode(oepos.bh, inode);
}
}
-
+
brelse(epos.bh);
brelse(oepos.bh);
return (elen >> 30);