[CVE-2022-41848] char: pcmcia: synclink_cs: Fix use-after-free in mgslpc_ops - #804
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A race condition may occur if the user physically removes the pcmcia device while calling ioctl() for this tty device node. This is a race condition between the mgslpc_ioctl() function and the mgslpc_detach() function, which may eventually result in UAF. So, add a refcount check to mgslpc_detach() to free the structure after the tty device node is close()d. Signed-off-by: Hyunwoo Kim <imv4bel@gmail.com> Link: https://lore.kernel.org/lkml/20220919040251.GA302541%40ubuntu/T/#rc85e751f467b3e6f9ccef92cfa7fb8a6cc50c270 Signed-off-by: Triet Hoang <triet.hoang@datalogic.com>
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A race condition may occur if the user physically removes the pcmcia device while calling ioctl() for this tty device node.
This is a race condition between the mgslpc_ioctl() function and the mgslpc_detach() function, which may eventually result in UAF.
So, add a refcount check to mgslpc_detach() to free the structure after the tty device node is close()d.
Link: https://lore.kernel.org/lkml/20220919040251.GA302541%40ubuntu/T/#rc85e751f467b3e6f9ccef92cfa7fb8a6cc50c270