author: Linus Torvalds <torvalds@linux-foundation.org> 2021-02-21 11:02:48 -0800
committer: Linus Torvalds <torvalds@linux-foundation.org> 2021-02-21 11:02:48 -0800
commit: 582cd91f69de8e44857cb610ebca661dac8656b7
parent: bd018bbaa58640da786d4289563e71c5ef3938c7
Commit Summary:
Diffstat:
1 file changed, 6 insertions, 3 deletions
diff --git a/fs/splice.c b/fs/splice.c
index b06846f1e6ee..5dbce4dcc1a7 100644
--- a/fs/splice.c
+++ b/fs/splice.c
@@ -662,12 +662,14 @@ iter_file_splice_write(struct pipe_inode_info *pipe, struct file *out,
/* build the vector */
left = sd.total_len;
- for (n = 0; !pipe_empty(head, tail) && left && n < nbufs; tail++, n++) {
+ for (n = 0; !pipe_empty(head, tail) && left && n < nbufs; tail++) {
struct pipe_buffer *buf = &pipe->bufs[tail & mask];
size_t this_len = buf->len;
- if (this_len > left)
- this_len = left;
+ /* zero-length bvecs are not supported, skip them */
+ if (!this_len)
+ continue;
+ this_len = min(this_len, left);
ret = pipe_buf_confirm(pipe, buf);
if (unlikely(ret)) {
@@ -680,6 +682,7 @@ iter_file_splice_write(struct pipe_inode_info *pipe, struct file *out,
array[n].bv_len = this_len;
array[n].bv_offset = buf->offset;
left -= this_len;
+ n++;
}
iov_iter_bvec(&from, WRITE, array, n, sd.total_len - left);