提交 5faf153e 编写于 作者: A Al Viro

don't call file_pos_write() if vfs_{read,write}{,v}() fails

Signed-off-by: NAl Viro <viro@zeniv.linux.org.uk>
上级 13f8e981
......@@ -477,7 +477,8 @@ SYSCALL_DEFINE3(read, unsigned int, fd, char __user *, buf, size_t, count)
if (f.file) {
loff_t pos = file_pos_read(f.file);
ret = vfs_read(f.file, buf, count, &pos);
file_pos_write(f.file, pos);
if (ret >= 0)
file_pos_write(f.file, pos);
fdput(f);
}
return ret;
......@@ -492,7 +493,8 @@ SYSCALL_DEFINE3(write, unsigned int, fd, const char __user *, buf,
if (f.file) {
loff_t pos = file_pos_read(f.file);
ret = vfs_write(f.file, buf, count, &pos);
file_pos_write(f.file, pos);
if (ret >= 0)
file_pos_write(f.file, pos);
fdput(f);
}
......@@ -780,7 +782,8 @@ SYSCALL_DEFINE3(readv, unsigned long, fd, const struct iovec __user *, vec,
if (f.file) {
loff_t pos = file_pos_read(f.file);
ret = vfs_readv(f.file, vec, vlen, &pos);
file_pos_write(f.file, pos);
if (ret >= 0)
file_pos_write(f.file, pos);
fdput(f);
}
......@@ -799,7 +802,8 @@ SYSCALL_DEFINE3(writev, unsigned long, fd, const struct iovec __user *, vec,
if (f.file) {
loff_t pos = file_pos_read(f.file);
ret = vfs_writev(f.file, vec, vlen, &pos);
file_pos_write(f.file, pos);
if (ret >= 0)
file_pos_write(f.file, pos);
fdput(f);
}
......@@ -959,7 +963,8 @@ COMPAT_SYSCALL_DEFINE3(readv, unsigned long, fd,
return -EBADF;
pos = f.file->f_pos;
ret = compat_readv(f.file, vec, vlen, &pos);
f.file->f_pos = pos;
if (ret >= 0)
f.file->f_pos = pos;
fdput(f);
return ret;
}
......@@ -1025,7 +1030,8 @@ COMPAT_SYSCALL_DEFINE3(writev, unsigned long, fd,
return -EBADF;
pos = f.file->f_pos;
ret = compat_writev(f.file, vec, vlen, &pos);
f.file->f_pos = pos;
if (ret >= 0)
f.file->f_pos = pos;
fdput(f);
return ret;
}
......
Markdown is supported
0% .
You are about to add 0 people to the discussion. Proceed with caution.
先完成此消息的编辑!
想要评论请 注册