[PATCH 5.5 019/150] thunderbolt: Prevent crash if non-active NVMem file is read

[Greg Kroah-Hartman]

From: Mika Westerberg <mika.westerberg@xxxxxxxxxxxxxxx>

commit 03cd45d2e219301880cabc357e3cf478a500080f upstream.

The driver does not populate .reg_read callback for the non-active NVMem
because the file is supposed to be write-only. However, it turns out
NVMem subsystem does not yet support this and expects that the .reg_read
callback is provided. If user reads the binary attribute it triggers
NULL pointer dereference like this one:

  BUG: kernel NULL pointer dereference, address: 0000000000000000
  ...
  Call Trace:
   bin_attr_nvmem_read+0x64/0x80
   kernfs_fop_read+0xa7/0x180
   vfs_read+0xbd/0x170
   ksys_read+0x5a/0xd0
   do_syscall_64+0x43/0x150
   entry_SYSCALL_64_after_hwframe+0x44/0xa9

Fix this in the driver by providing .reg_read callback that always
returns an error.

Reported-by: Nicholas Johnson <nicholas.johnson-opensource@xxxxxxxxxxxxxx>
Fixes: e6b245ccd524 ("thunderbolt: Add support for host and device NVM firmware upgrade")
Signed-off-by: Mika Westerberg <mika.westerberg@xxxxxxxxxxxxxxx>
Cc: stable@xxxxxxxxxxxxxxx
Link: https://lore.kernel.org/r/20200213095604.1074-1-mika.westerberg@xxxxxxxxxxxxxxx
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>

---
 drivers/thunderbolt/switch.c |    7 +++++++
 1 file changed, 7 insertions(+)

--- a/drivers/thunderbolt/switch.c
+++ b/drivers/thunderbolt/switch.c
@@ -274,6 +274,12 @@ out:
 	return ret;
 }
 
+static int tb_switch_nvm_no_read(void *priv, unsigned int offset, void *val,
+				 size_t bytes)
+{
+	return -EPERM;
+}
+
 static int tb_switch_nvm_write(void *priv, unsigned int offset, void *val,
 			       size_t bytes)
 {
@@ -319,6 +325,7 @@ static struct nvmem_device *register_nvm
 		config.read_only = true;
 	} else {
 		config.name = "nvm_non_active";
+		config.reg_read = tb_switch_nvm_no_read;
 		config.reg_write = tb_switch_nvm_write;
 		config.root_only = true;
 	}