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authorDavid Howells <dhowells@redhat.com>2020-11-14 17:27:57 +0000
committerLinus Torvalds <torvalds@linux-foundation.org>2020-11-14 11:51:18 -0800
commit3ad216ee73abc554ed8f13f4f8b70845a7bef6da (patch)
tree7c211765eff4950a262064f52a6831b960d61569 /fs/afs
parentf01c30de86f1047e9bae1b1b1417b0ce8dcd15b1 (diff)
afs: Fix afs_write_end() when called with copied == 0 [ver #3]
When afs_write_end() is called with copied == 0, it tries to set the dirty region, but there's no way to actually encode a 0-length region in the encoding in page->private. "0,0", for example, indicates a 1-byte region at offset 0. The maths miscalculates this and sets it incorrectly. Fix it to just do nothing but unlock and put the page in this case. We don't actually need to mark the page dirty as nothing presumably changed. Fixes: 65dd2d6072d3 ("afs: Alter dirty range encoding in page->private") Signed-off-by: David Howells <dhowells@redhat.com> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'fs/afs')
-rw-r--r--fs/afs/write.c5
1 files changed, 4 insertions, 1 deletions
diff --git a/fs/afs/write.c b/fs/afs/write.c
index 50371207f327..c9195fc67fd8 100644
--- a/fs/afs/write.c
+++ b/fs/afs/write.c
@@ -169,11 +169,14 @@ int afs_write_end(struct file *file, struct address_space *mapping,
unsigned int f, from = pos & (PAGE_SIZE - 1);
unsigned int t, to = from + copied;
loff_t i_size, maybe_i_size;
- int ret;
+ int ret = 0;
_enter("{%llx:%llu},{%lx}",
vnode->fid.vid, vnode->fid.vnode, page->index);
+ if (copied == 0)
+ goto out;
+
maybe_i_size = pos + copied;
i_size = i_size_read(&vnode->vfs_inode);