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-rw-r--r--fs/fat/fat_write.c4
1 files changed, 3 insertions, 1 deletions
diff --git a/fs/fat/fat_write.c b/fs/fat/fat_write.c
index f946030f7d8..8e4a235d7cb 100644
--- a/fs/fat/fat_write.c
+++ b/fs/fat/fat_write.c
@@ -813,7 +813,9 @@ set_contents(fsdata *mydata, dir_entry *dentptr, loff_t pos, __u8 *buffer,
offset = 0;
else
offset = pos - cur_pos;
- wsize = min(cur_pos + actsize, filesize) - pos;
+ wsize = min_t(unsigned long long, actsize, filesize - cur_pos);
+ wsize -= offset;
+
if (get_set_cluster(mydata, curclust, offset,
buffer, wsize, &actsize)) {
printf("Error get-and-setting cluster\n");