[PATCH 5.15.y] ocfs2: fix shift-out-of-bounds UBSAN bug in ocfs2_verify_volume

[1016331059@xxxxxx]

This patch is a backport to stable 5.15.y of upstream commit

7f86b2942791012ac7b4c481d1f84a58fd2fbcfc

("ocfs2: fix shift-out-of-bounds UBSAN bug in ocfs2_verify_volume()").

This patch addresses a shift-out-of-bounds error in the

ocfs2_verify_volume() function. The bug can be triggered by an invalid

s_clustersize_bits value, which causes the _expression_

  1 << le32_to_cpu(di->id2.i_super.s_clustersize_bits)

to exceed the valid shift range of a 32-bit integer, leading to an

out-of-bounds shift reported by UBSAN.

Instead of performing the invalid shift while printing the error message,

log the raw s_clustersize_bits value directly.

This backport was also tested by syzbot on Linux 5.15.201

(commit 3330a8d33e086f76608bb4e80a3dc569d04a8814 in the stable 5.15.y

tree), and the reproducer did not trigger any issue.

[ Upstream commit 7f86b2942791012ac7b4c481d1f84a58fd2fbcfc ]

Link: https://lkml.kernel.org/r/ZsPvwQAXd5R/jNY+@hostname

Reported-by: syzbot <syzbot+f3fff775402751ebb471@xxxxxxxxxxxxxxxxxxxxxxxxx>

Closes: https://syzkaller.appspot.com/bug?extid=f3fff775402751ebb471

Tested-by: syzbot <syzbot+f3fff775402751ebb471@xxxxxxxxxxxxxxxxxxxxxxxxx>

Reviewed-by: Joseph Qi <joseph.qi@xxxxxxxxxxxxxxxxx>

Link: https://syzkaller.appspot.com/bug?extid=c6104ecfe56e0fd6b616

Tested-by: syzbot <syzbot+c6104ecfe56e0fd6b616@xxxxxxxxxxxxxxxxxxxxxxxxx>

Signed-off-by: Qasim Ijaz <qasdev00@xxxxxxxxx>

Signed-off-by: Changjian Liu <driz2t@xxxxxx>

Attachment: c6104ecfe56e0fd6b616.patch
Description: c6104ecfe56e0fd6b616.patch