From c37336b078ba9d2ff38c535b194996a7ad6e69f8 Mon Sep 17 00:00:00 2001 From: Evgeniy Dushistov Date: Sun, 27 Aug 2006 01:23:45 -0700 Subject: [PATCH] [PATCH] ufs: write to hole in big file On UFS, this scenario: open(O_TRUNC) lseek(1024 * 1024 * 80) write("A") lseek(1024 * 2) write("A") may cause access to invalid address. This happened because of "goal" is calculated in wrong way in block allocation path, as I see this problem exists also in 2.4. We use construction like this i_data[lastfrag], i_data array of pointers to direct blocks, indirect and so on, it has ceratain size ~20 elements, and lastfrag may have value for example 40000. Also this patch fixes related to handling such scenario issues, wrong zeroing metadata, in case of block(not fragment) allocation, and wrong goal calculation, when we allocate block Signed-off-by: Evgeniy Dushistov Signed-off-by: Andrew Morton Signed-off-by: Linus Torvalds --- fs/ufs/inode.c | 35 +++++++++++++++++++++-------------- 1 file changed, 21 insertions(+), 14 deletions(-) diff --git a/fs/ufs/inode.c b/fs/ufs/inode.c index e7c8615..30c6e8a 100644 --- a/fs/ufs/inode.c +++ b/fs/ufs/inode.c @@ -169,18 +169,20 @@ static void ufs_clear_frag(struct inode *inode, struct buffer_head *bh) static struct buffer_head * ufs_clear_frags(struct inode *inode, sector_t beg, - unsigned int n) + unsigned int n, sector_t want) { - struct buffer_head *res, *bh; + struct buffer_head *res = NULL, *bh; sector_t end = beg + n; - res = sb_getblk(inode->i_sb, beg); - ufs_clear_frag(inode, res); - for (++beg; beg < end; ++beg) { + for (; beg < end; ++beg) { bh = sb_getblk(inode->i_sb, beg); ufs_clear_frag(inode, bh); - brelse(bh); + if (want != beg) + brelse(bh); + else + res = bh; } + BUG_ON(!res); return res; } @@ -265,7 +267,9 @@ repeat: lastfrag = ufsi->i_lastfrag; } - goal = fs32_to_cpu(sb, ufsi->i_u1.i_data[lastblock]) + uspi->s_fpb; + tmp = fs32_to_cpu(sb, ufsi->i_u1.i_data[lastblock]); + if (tmp) + goal = tmp + uspi->s_fpb; tmp = ufs_new_fragments (inode, p, fragment - blockoff, goal, required + blockoff, err, locked_page); @@ -277,13 +281,15 @@ repeat: tmp = ufs_new_fragments(inode, p, fragment - (blockoff - lastblockoff), fs32_to_cpu(sb, *p), required + (blockoff - lastblockoff), err, locked_page); - } + } else /* (lastblock > block) */ { /* * We will allocate new block before last allocated block */ - else /* (lastblock > block) */ { - if (lastblock && (tmp = fs32_to_cpu(sb, ufsi->i_u1.i_data[lastblock-1]))) - goal = tmp + uspi->s_fpb; + if (block) { + tmp = fs32_to_cpu(sb, ufsi->i_u1.i_data[block-1]); + if (tmp) + goal = tmp + uspi->s_fpb; + } tmp = ufs_new_fragments(inode, p, fragment - blockoff, goal, uspi->s_fpb, err, locked_page); } @@ -296,7 +302,7 @@ repeat: } if (!phys) { - result = ufs_clear_frags(inode, tmp + blockoff, required); + result = ufs_clear_frags(inode, tmp, required, tmp + blockoff); } else { *phys = tmp + blockoff; result = NULL; @@ -383,7 +389,7 @@ repeat: } } - if (block && (tmp = fs32_to_cpu(sb, ((__fs32*)bh->b_data)[block-1]) + uspi->s_fpb)) + if (block && (tmp = fs32_to_cpu(sb, ((__fs32*)bh->b_data)[block-1]))) goal = tmp + uspi->s_fpb; else goal = bh->b_blocknr + uspi->s_fpb; @@ -397,7 +403,8 @@ repeat: if (!phys) { - result = ufs_clear_frags(inode, tmp + blockoff, uspi->s_fpb); + result = ufs_clear_frags(inode, tmp, uspi->s_fpb, + tmp + blockoff); } else { *phys = tmp + blockoff; *new = 1; -- 2.7.4