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-rw-r--r--arch/um/os-Linux/mem.c7
1 files changed, 5 insertions, 2 deletions
diff --git a/arch/um/os-Linux/mem.c b/arch/um/os-Linux/mem.c
index d24d1a96052..560c8063c77 100644
--- a/arch/um/os-Linux/mem.c
+++ b/arch/um/os-Linux/mem.c
@@ -210,8 +210,11 @@ int create_tmp_file(unsigned long long len)
exit(1);
}
- if (lseek64(fd, len, SEEK_SET) < 0) {
- perror("os_seek_file");
+ /* Seek to len - 1 because writing a character there will
+ * increase the file size by one byte, to the desired length.
+ */
+ if (lseek64(fd, len - 1, SEEK_SET) < 0) {
+ perror("os_seek_file");
exit(1);
}