ocfs2: handle a symlink read error correctly

Vulnerability Description

In the Linux kernel, the following vulnerability has been resolved: ocfs2: handle a symlink read error correctly Patch series "Convert ocfs2 to use folios". Mark did a conversion of ocfs2 to use folios and sent it to me as a giant patch for review ;-) So I've redone it as individual patches, and credited Mark for the patches where his code is substantially the same. It's not a bad way to do it; his patch had some bugs and my patches had some bugs. Hopefully all our bugs were different from each other. And hopefully Mark likes all the changes I made to his code! This patch (of 23): If we can't read the buffer, be sure to unlock the page before returning.

References

• https://git.kernel.org/stable/c/cd3e22b206189cbb4a94229002141e1529f83746
• https://git.kernel.org/stable/c/afa8003f8db62e46c4b171cbf4cec2824148b4f7
• https://git.kernel.org/stable/c/8aee4184c5b79e486598c15aa80687c77f6f6e6e
• https://git.kernel.org/stable/c/6e143eb4ab83c24e7ad3e3d8e7daa241d9c38377
• https://git.kernel.org/stable/c/b6833b38984d1e9f20dd80f9ec9050c10d687f30
• https://git.kernel.org/stable/c/52a326f93ceb9348264fddf7bab6e345db69e08c
• https://git.kernel.org/stable/c/5e3b3ec7c3cb5ba5629a766e4f0926db72cf0a1f
• https://git.kernel.org/stable/c/2b4c2094da6d84e69b843dd3317902e977bf64bd