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fuse: fix fuse_retrieve

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Fix two bugs in fuse_retrieve():

 - retrieving more than one page would yield repeated instances of the
   first page

 - if more than FUSE_MAX_PAGES_PER_REQ pages were requested than the
   request page array would overflow

fuse_retrieve() was added in 2.6.36 and these bugs had been there since the
beginning.

Signed-off-by: Miklos Szeredi <mszeredi@suse.cz>
CC: stable@vger.kernel.org
This commit is contained in:
Miklos Szeredi 2011-12-13 10:36:59 +01:00
parent dc47ce90c3
commit 48706d0a91
1 changed files with 2 additions and 1 deletions
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3
fs/fuse/dev.c
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@ -1512,7 +1512,7 @@ static int fuse_retrieve(struct fuse_conn *fc, struct inode *inode,
else if (outarg->offset + num > file_size)
num = file_size - outarg->offset;
while (num) {
while (num && req->num_pages < FUSE_MAX_PAGES_PER_REQ) {
struct page *page;
unsigned int this_num;
@ -1526,6 +1526,7 @@ static int fuse_retrieve(struct fuse_conn *fc, struct inode *inode,
num -= this_num;
total_len += this_num;
index++;
}
req->misc.retrieve_in.offset = outarg->offset;
req->misc.retrieve_in.size = total_len;