ghes_edac: Add a null pointer check in ghes_edac_unregister

Add a null check for ghes_pvt, before dereferencing it. The pointer could still be null in case the return path is taken before initialising ghes_pvt in the registration function.

ghes_edac_register function can return a 0 without initialising ghes_pvt -- this is not taken as an error in ghes_probe. A subsequent call to ghes_edac_unregister would result in ghes_pvt getting dereferenced, resulting in a panic.

Signed-off-by Sughosh Ganu <[email protected]>

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 drivers/edac/ghes_edac.c | 3 +++
 1 file changed, 3 insertions(+)