__generic_block_fiemap() looks up extents within isize, so original
function truncate len to isize if len >= isize, but when start > 0,
start + len would still be greater than isize.
Update len properly in this patch.
Signed-off-by: Fan Li <fanofcode.li@xxxxxxxxxxx>
---
fs/ioctl.c | 7 +++++--
1 file changed, 5 insertions(+), 2 deletions(-)
diff --git a/fs/ioctl.c b/fs/ioctl.c
index 41c352e..13a3e96 100644
--- a/fs/ioctl.c
+++ b/fs/ioctl.c
@@ -268,9 +268,12 @@ int __generic_block_fiemap(struct inode *inode,
* since we expect isize to not change at all through the duration of
* this call.
*/
- if (len >= isize) {
+ if (start >= isize)
+ return 0;
+
+ if (start + len > isize) {
whole_file = true;
- len = isize;
+ len = isize - start;
}
/*
--
1.7.9.5
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