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authorAl Viro <viro@ftp.linux.org.uk>2006-04-26 02:26:09 -0400
committerLinus Torvalds <torvalds@g5.osdl.org>2006-04-26 10:52:21 -0400
commitde0bb97aff6743f71abb8ec581238e2bdae9cdd1 (patch)
tree86bf40b0545ca3b125864065aeb1ec4b3791aabf /fs/ext3
parentc82ffb07cd1aa356c599999c4f0dc5155a91d318 (diff)
[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>
Diffstat (limited to 'fs/ext3')
-rw-r--r--fs/ext3/resize.c2
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,
213 goto exit_bh; 213 goto exit_bh;
214 } 214 }
215 lock_buffer(bh); 215 lock_buffer(bh);
216 memcpy(gdb->b_data, sbi->s_group_desc[i], bh->b_size); 216 memcpy(gdb->b_data, sbi->s_group_desc[i]->b_data, bh->b_size);
217 set_buffer_uptodate(gdb); 217 set_buffer_uptodate(gdb);
218 unlock_buffer(bh); 218 unlock_buffer(bh);
219 ext3_journal_dirty_metadata(handle, gdb); 219 ext3_journal_dirty_metadata(handle, gdb);