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authorMiklos Szeredi <miklos@szeredi.hu>2006-04-10 22:54:49 -0700
committerLinus Torvalds <torvalds@g5.osdl.org>2006-04-11 06:18:47 -0700
commitd3406ffa4af8af1d7c14cff06e003eb0a557d4ad (patch)
treee521174613659a167f56e9890c403f9fa95a50ca /fs/fuse
parent3e16f6afb267c0256416d481862ce8019c33417d (diff)
downloadblackbird-op-linux-d3406ffa4af8af1d7c14cff06e003eb0a557d4ad.tar.gz
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[PATCH] fuse: fix oops in fuse_send_readpages()
During heavy parallel filesystem activity it was possible to Oops the kernel. The reason is that read_cache_pages() could skip pages which have already been inserted into the cache by another task. Occasionally this may result in zero pages actually being sent, while fuse_send_readpages() relies on at least one page being in the request. So check this corner case and just free the request instead of trying to send it. Reported and tested by Konstantin Isakov. Signed-off-by: Miklos Szeredi <miklos@szeredi.hu> Signed-off-by: Andrew Morton <akpm@osdl.org> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
Diffstat (limited to 'fs/fuse')
-rw-r--r--fs/fuse/file.c8
1 files changed, 6 insertions, 2 deletions
diff --git a/fs/fuse/file.c b/fs/fuse/file.c
index 975f2697e866..3ac39c0288de 100644
--- a/fs/fuse/file.c
+++ b/fs/fuse/file.c
@@ -397,8 +397,12 @@ static int fuse_readpages(struct file *file, struct address_space *mapping,
return -EINTR;
err = read_cache_pages(mapping, pages, fuse_readpages_fill, &data);
- if (!err)
- fuse_send_readpages(data.req, file, inode);
+ if (!err) {
+ if (data.req->num_pages)
+ fuse_send_readpages(data.req, file, inode);
+ else
+ fuse_put_request(fc, data.req);
+ }
return err;
}
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