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CIFS: cifs_writepages should not write beyond end of file

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Signed-off-by: Dave Kleikamp <shaggy@austin.ibm.com>
Signed-off-by: Steve French <sfrench@us.ibm.com>
This commit is contained in:
Steve French 2005-10-12 15:32:05 -07:00
parent 47c786e79b
commit 84d2f07e8e
1 changed files with 13 additions and 2 deletions
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15
fs/cifs/file.c
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@ -1011,6 +1011,7 @@ static int cifs_writepages(struct address_space *mapping,
pgoff_t index;
int is_range = 0;
struct kvec iov[32];
int len;
int n_iov = 0;
pgoff_t next;
int nr_pages;
@ -1124,16 +1125,26 @@ retry:
unlock_page(page);
break;
}
if (page_offset(page) >= mapping->host->i_size) {
done = 1;
unlock_page(page);
break;
}
/*
* BB can we get rid of this? pages are held by pvec
*/
page_cache_get(page);
len = min(mapping->host->i_size - page_offset(page),
(loff_t)PAGE_CACHE_SIZE);
/* reserve iov[0] for the smb header */
n_iov++;
iov[n_iov].iov_base = kmap(page);
iov[n_iov].iov_len = PAGE_CACHE_SIZE;
bytes_to_write += PAGE_CACHE_SIZE;
iov[n_iov].iov_len = len;
bytes_to_write += len;
if (first < 0) {
first = i;