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libext2fs: set the fs block size to new_io in ext2fs_rewrite_to_io() 

e2image manually opens a new IO channel, and then sets the file system
to use this new IO channel via ext2fs_rewrite+to_io().  We need to
make sure the IO channel is set to the file system's block size to
avoid some nasty buffer overruns.

[ Modified by tytso to use io_channel_set_blksize() ]

Signed-off-by: Kit Westneat <kwestneat@ddn.com>
Signed-off-by: "Theodore Ts'o" <tytso@mit.edu>
Reviewed-by: Andreas Dilger <andreas.dilger@intel.com>
debian-1.42.9
Kit Westneat 2013-12-02 14:47:08 -05:00 committed by Theodore Ts'o
parent 4c2ae57d38
commit 8b3c52fb81
1 changed files with 5 additions and 0 deletions
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5
lib/ext2fs/openfs.c
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@ -451,8 +451,13 @@ errcode_t ext2fs_set_data_io(ext2_filsys fs, io_channel new_io)
errcode_t ext2fs_rewrite_to_io(ext2_filsys fs, io_channel new_io)
{
errcode_t err;
if ((fs->flags & EXT2_FLAG_IMAGE_FILE) == 0)
return EXT2_ET_NOT_IMAGE_FILE;
err = io_channel_set_blksize(new_io, fs->blocksize);
if (err)
return err;
fs->io = fs->image_io = new_io;
fs->flags |= EXT2_FLAG_DIRTY | EXT2_FLAG_RW |
EXT2_FLAG_BB_DIRTY | EXT2_FLAG_IB_DIRTY;