lkml.org 
[lkml]   [2006]   [Apr]   [26]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
Patch in this message
/
Date
From
Subject[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>

---

fs/ext3/resize.c | 2 +-
1 files changed, 1 insertions(+), 1 deletions(-)

e26179ed6fdd952b91a313a275191ae97bcd4d71
diff --git a/fs/ext3/resize.c b/fs/ext3/resize.c
index c5ffa85..8aac533 100644
--- a/fs/ext3/resize.c
+++ b/fs/ext3/resize.c
@@ -213,7 +213,7 @@ static int setup_new_group_blocks(struct
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);
--
1.3.0.g0080f
-
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@vger.kernel.org
More majordomo info at http://vger.kernel.org/majordomo-info.html
Please read the FAQ at http://www.tux.org/lkml/

\
 
 \ /
  Last update: 2006-04-26 08:28    [W:0.040 / U:0.216 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site