diff options
| author | Al Viro <viro@ftp.linux.org.uk> | 2006-04-26 07:26:09 +0100 |
|---|---|---|
| committer | Linus Torvalds <torvalds@g5.osdl.org> | 2006-04-26 07:52:21 -0700 |
| commit | de0bb97aff6743f71abb8ec581238e2bdae9cdd1 (patch) | |
| tree | 86bf40b0545ca3b125864065aeb1ec4b3791aabf | |
| parent | c82ffb07cd1aa356c599999c4f0dc5155a91d318 (diff) | |
| download | lwn-de0bb97aff6743f71abb8ec581238e2bdae9cdd1.tar.gz lwn-de0bb97aff6743f71abb8ec581238e2bdae9cdd1.zip | |
[PATCH] forgotten ->b_data in memcpy() call in ext3/resize.c (oopsable)
sbi->s_group_desc is an array of pointers to buffer_head. memcpy() of
buffer size from address of buffer_head is a bad idea - it will generate
junk in any case, may oops if buffer_head is close to the end of slab
page and next page is not mapped and isn't what was intended there.
IOW, ->b_data is missing in that call. Fortunately, result doesn't go
into the primary on-disk data structures, so only backup ones get crap
written to them; that had allowed this bug to remain unnoticed until
now.
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
| -rw-r--r-- | fs/ext3/resize.c | 2 |
1 files changed, 1 insertions, 1 deletions
diff --git a/fs/ext3/resize.c b/fs/ext3/resize.c index c5ffa8523968..8aac5334680d 100644 --- a/fs/ext3/resize.c +++ b/fs/ext3/resize.c @@ -213,7 +213,7 @@ static int setup_new_group_blocks(struct super_block *sb, goto exit_bh; } lock_buffer(bh); - memcpy(gdb->b_data, sbi->s_group_desc[i], bh->b_size); + memcpy(gdb->b_data, sbi->s_group_desc[i]->b_data, bh->b_size); set_buffer_uptodate(gdb); unlock_buffer(bh); ext3_journal_dirty_metadata(handle, gdb); |