When ioremap() fails in qe_reset(), the global pointer qe_immr remains
NULL, leading to a subsequent NULL pointer dereference when the pointer
is accessed. Since this happens early in the boot process, a failure to
map a few bytes of I/O memory indicates a fatal error from which the
system cannot recover.

Follow the same pattern as qe_sdma_init() and panic immediately when
ioremap() fails. This avoids a silent NULL pointer dereference later
and makes the error explicit.

Fixes: 986585385131 ("[POWERPC] Add QUICC Engine (QE) infrastructure")
Cc: stable@vger.kernel.org
Signed-off-by: Wang Jun <1742789905@qq.com>
---
 drivers/soc/fsl/qe/qe.c | 6 +++++-
 1 file changed, 5 insertions(+), 1 deletion(-)

diff --git a/drivers/soc/fsl/qe/qe.c b/drivers/soc/fsl/qe/qe.c
index 70b6eddb867b..9f6223043ee3 100644
--- a/drivers/soc/fsl/qe/qe.c
+++ b/drivers/soc/fsl/qe/qe.c
@@ -86,8 +86,12 @@ static phys_addr_t get_qe_base(void)
 
 void qe_reset(void)
 {
-	if (qe_immr == NULL)
+	if (qe_immr == NULL) {
 		qe_immr = ioremap(get_qe_base(), QE_IMMAP_SIZE);
+		if (qe_immr == NULL) {
+			panic("QE:ioremap failed!");
+		}
+	}
 
 	qe_snums_init();
 
-- 
2.43.0

Le 27/03/2026 à 01:12, Wang Jun a écrit :
> [Vous ne recevez pas souvent de courriers de 1742789905@qq.com. Découvrez pourquoi ceci est important à https://aka.ms/LearnAboutSenderIdentification ]
> 
> When ioremap() fails in qe_reset(), the global pointer qe_immr remains
> NULL, leading to a subsequent NULL pointer dereference when the pointer
> is accessed. Since this happens early in the boot process, a failure to
> map a few bytes of I/O memory indicates a fatal error from which the
> system cannot recover.
> 
> Follow the same pattern as qe_sdma_init() and panic immediately when
> ioremap() fails. This avoids a silent NULL pointer dereference later
> and makes the error explicit.
> 
> Fixes: 986585385131 ("[POWERPC] Add QUICC Engine (QE) infrastructure")
> Cc: stable@vger.kernel.org
> Signed-off-by: Wang Jun <1742789905@qq.com>
> ---
>   drivers/soc/fsl/qe/qe.c | 6 +++++-
>   1 file changed, 5 insertions(+), 1 deletion(-)
> 
> diff --git a/drivers/soc/fsl/qe/qe.c b/drivers/soc/fsl/qe/qe.c
> index 70b6eddb867b..9f6223043ee3 100644
> --- a/drivers/soc/fsl/qe/qe.c
> +++ b/drivers/soc/fsl/qe/qe.c
> @@ -86,8 +86,12 @@ static phys_addr_t get_qe_base(void)
> 
>   void qe_reset(void)
>   {
> -       if (qe_immr == NULL)
> +       if (qe_immr == NULL) {
>                  qe_immr = ioremap(get_qe_base(), QE_IMMAP_SIZE);
> +               if (qe_immr == NULL) {
> +                       panic("QE:ioremap failed!");
> +               }
> +       }
> 
>          qe_snums_init();
> 

Applied, thanks.