The patch titled cramfs: propagate uncompression errors has been added to the -mm tree. Its filename is cramfs-propagate-uncompression-errors-v21.patch Before you just go and hit "reply", please: a) Consider who else should be cc'ed b) Prefer to cc a suitable mailing list as well c) Ideally: find the original patch on the mailing list and do a reply-to-all to that, adding suitable additional cc's *** Remember to use Documentation/SubmitChecklist when testing your code *** See http://userweb.kernel.org/~akpm/stuff/added-to-mm.txt to find out what to do about this The current -mm tree may be found at http://userweb.kernel.org/~akpm/mmotm/ ------------------------------------------------------ Subject: cramfs: propagate uncompression errors From: David VomLehn <dvomlehn@xxxxxxxxx> Decompression errors can arise due to corruption of compressed blocks on flash or in memory. This patch propagates errors detected during decompression back to the block layer. Signed-off-by: David VomLehn <dvomlehn@xxxxxxxxx> Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx> --- fs/cramfs/inode.c | 36 ++++++++++++++++++++++++++---------- fs/cramfs/uncompress.c | 2 +- 2 files changed, 27 insertions(+), 11 deletions(-) diff -puN fs/cramfs/inode.c~cramfs-propagate-uncompression-errors-v21 fs/cramfs/inode.c --- a/fs/cramfs/inode.c~cramfs-propagate-uncompression-errors-v21 +++ a/fs/cramfs/inode.c @@ -459,11 +459,14 @@ static struct dentry * cramfs_lookup(str static int cramfs_readpage(struct file *file, struct page * page) { struct inode *inode = page->mapping->host; - u32 maxblock, bytes_filled; + u32 maxblock; + int bytes_filled; void *pgdata; maxblock = (inode->i_size + PAGE_CACHE_SIZE - 1) >> PAGE_CACHE_SHIFT; bytes_filled = 0; + pgdata = kmap(page); + if (page->index < maxblock) { struct super_block *sb = inode->i_sb; u32 blkptr_offset = OFFSET(inode) + page->index*4; @@ -472,30 +475,43 @@ static int cramfs_readpage(struct file * start_offset = OFFSET(inode) + maxblock*4; mutex_lock(&read_mutex); if (page->index) - start_offset = *(u32 *) cramfs_read(sb, blkptr_offset-4, 4); - compr_len = (*(u32 *) cramfs_read(sb, blkptr_offset, 4) - start_offset); + start_offset = *(u32 *) cramfs_read(sb, blkptr_offset-4, + 4); + compr_len = (*(u32 *) cramfs_read(sb, blkptr_offset, 4) - + start_offset); mutex_unlock(&read_mutex); - pgdata = kmap(page); + if (compr_len == 0) ; /* hole */ - else if (compr_len > (PAGE_CACHE_SIZE << 1)) - printk(KERN_ERR "cramfs: bad compressed blocksize %u\n", compr_len); - else { + else if (unlikely(compr_len > (PAGE_CACHE_SIZE << 1))) { + pr_err("cramfs: bad compressed blocksize %u\n", + compr_len); + goto err; + } else { mutex_lock(&read_mutex); bytes_filled = cramfs_uncompress_block(pgdata, PAGE_CACHE_SIZE, cramfs_read(sb, start_offset, compr_len), compr_len); mutex_unlock(&read_mutex); + if (unlikely(bytes_filled < 0)) + goto err; } - } else - pgdata = kmap(page); + } + memset(pgdata + bytes_filled, 0, PAGE_CACHE_SIZE - bytes_filled); - kunmap(page); flush_dcache_page(page); + kunmap(page); SetPageUptodate(page); unlock_page(page); return 0; + +err: + kunmap(page); + ClearPageUptodate(page); + SetPageError(page); + unlock_page(page); + return 0; } static const struct address_space_operations cramfs_aops = { diff -puN fs/cramfs/uncompress.c~cramfs-propagate-uncompression-errors-v21 fs/cramfs/uncompress.c --- a/fs/cramfs/uncompress.c~cramfs-propagate-uncompression-errors-v21 +++ a/fs/cramfs/uncompress.c @@ -50,7 +50,7 @@ int cramfs_uncompress_block(void *dst, i err: printk("Error %d while decompressing!\n", err); printk("%p(%d)->%p(%d)\n", src, srclen, dst, dstlen); - return 0; + return -EIO; } int cramfs_uncompress_init(void) _ Patches currently in -mm which might be from dvomlehn@xxxxxxxxx are cramfs-propagate-uncompression-errors-v21.patch cramfs-propagate-uncompression-errors.patch -- To unsubscribe from this list: send the line "unsubscribe mm-commits" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html