From b5ac1fb2717e48177d3f73f9e4c9b556c0a24c6b Mon Sep 17 00:00:00 2001 From: Vincent Bernat Date: Sat, 15 Aug 2015 14:07:44 +0200 Subject: [PATCH] 9p: fix return code of read() when count is 0 When reading 0 bytes from an empty file on a 9P filesystem, the return code of read() was not 0 as expected due to an unitialized err variable. Tested with this simple program: #include #include #include #include #include int main(int argc, const char **argv) { assert(argc == 2); char buffer[256]; int fd = open(argv[1], O_RDONLY|O_NOCTTY); assert(fd >= 0); assert(read(fd, buffer, 0) == 0); return 0; } Signed-off-by: Vincent Bernat Signed-off-by: Eric Van Hensbergen --- fs/9p/vfs_file.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/fs/9p/vfs_file.c b/fs/9p/vfs_file.c index 1ef16bd..3abc447 100644 --- a/fs/9p/vfs_file.c +++ b/fs/9p/vfs_file.c @@ -381,7 +381,7 @@ static ssize_t v9fs_file_read_iter(struct kiocb *iocb, struct iov_iter *to) { struct p9_fid *fid = iocb->ki_filp->private_data; - int ret, err; + int ret, err = 0; p9_debug(P9_DEBUG_VFS, "count %zu offset %lld\n", iov_iter_count(to), iocb->ki_pos); -- 2.7.4