video: hgafb: fix potential NULL pointer dereference

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commit dc13cac486 upstream.

The return of ioremap if not checked, and can lead to a NULL to be
assigned to hga_vram. Potentially leading to a NULL pointer
dereference.

The fix adds code to deal with this case in the error label and
changes how the hgafb_probe handles the return of hga_card_detect.

Cc: Ferenc Bakonyi <fero@drama.obuda.kando.hu>
Cc: Bartlomiej Zolnierkiewicz <b.zolnierkie@samsung.com>
Cc: stable <stable@vger.kernel.org>
Signed-off-by: Igor Matheus Andrade Torrente <igormtorrente@gmail.com>
Link: https://lore.kernel.org/r/20210503115736.2104747-40-gregkh@linuxfoundation.org
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

...

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Igor Matheus Andrade Torrente 2021-05-03 13:57:06 +02:00 • committed by Greg Kroah-Hartman

parent 98404acf0a

commit 8e0d302e7e

1 changed files with 13 additions and 8 deletions

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drivers/video/fbdev/hgafb.c

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