of/irq: Fix interrupt-map cell length check in of_irq_parse_imap_parent()

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commit fec3edc47d upstream.

On a malformed interrupt-map property which is shorter than expected by
1 cell, we may read bogus data past the end of the property instead of
returning an error in of_irq_parse_imap_parent().

Decrement the remaining length when skipping over the interrupt parent
phandle cell.

Fixes: 935df1bd40 ("of/irq: Factor out parsing of interrupt-map parent phandle+args from of_irq_parse_raw()")
Cc: stable@vger.kernel.org
Signed-off-by: Zijun Hu <quic_zijuhu@quicinc.com>
Link: https://lore.kernel.org/r/20241209-of_irq_fix-v1-1-782f1419c8a1@quicinc.com
[rh: reword commit msg]
Signed-off-by: Rob Herring (Arm) <robh@kernel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

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Zijun Hu 2024-12-09 21:24:59 +08:00 • committed by Greg Kroah-Hartman

parent 61f3036bc2

commit cd126daadf

1 changed files with 1 additions and 0 deletions

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drivers/of/irq.c

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