misc: bcm_vk: Fix possible null-pointer dereferences in bcm_vk_read()

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In the function bcm_vk_read(), the pointer entry is checked, indicating
that it can be NULL. If entry is NULL and rc is set to -EMSGSIZE, the
following code may cause null-pointer dereferences:

  struct vk_msg_blk tmp_msg = entry->to_h_msg[0];
  set_msg_id(&tmp_msg, entry->usr_msg_id);
  tmp_msg.size = entry->to_h_blks - 1;

To prevent these possible null-pointer dereferences, copy to_h_msg,
usr_msg_id, and to_h_blks from iter into temporary variables, and return
these temporary variables to the application instead of accessing them
through a potentially NULL entry.

Signed-off-by: Tuo Li <islituo@gmail.com>
Reviewed-by: Scott Branden <scott.branden@broadcom.com>
Link: https://patch.msgid.link/20251211063637.3987937-1-islituo@gmail.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

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Tuo Li 2025-12-11 14:36:37 +08:00 • committed by Greg Kroah-Hartman

parent b54c82d6cb

commit ba75ecb97d

1 changed files with 8 additions and 4 deletions

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drivers/misc/bcm-vk/bcm_vk_msg.c

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