5.15-stable review patch. If anyone has any objections, please let me know.
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From: Nam Cao namcao@linutronix.de
commit 3443ff3be6e59b80d74036bb39f5b6409eb23cc9 upstream.
pseries_irq_domain_alloc() allocates interrupts at parent's interrupt domain. If it fails in the progress, all allocated interrupts are freed.
The number of successfully allocated interrupts so far is stored "i". However, "i - 1" interrupts are freed. This is broken:
- One interrupt is not be freed
- If "i" is zero, "i - 1" wraps around
Correct the number of freed interrupts to 'i'.
Fixes: a5f3d2c17b07 ("powerpc/pseries/pci: Add MSI domains") Signed-off-by: Nam Cao namcao@linutronix.de Cc: stable@vger.kernel.org Reviewed-by: Cédric Le Goater clg@redhat.com Signed-off-by: Madhavan Srinivasan maddy@linux.ibm.com Link: https://patch.msgid.link/a980067f2b256bf716b4cd713bc1095966eed8cd.1754300646... Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.org --- arch/powerpc/platforms/pseries/msi.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-)
--- a/arch/powerpc/platforms/pseries/msi.c +++ b/arch/powerpc/platforms/pseries/msi.c @@ -607,7 +607,7 @@ static int pseries_irq_domain_alloc(stru
out: /* TODO: handle RTAS cleanup in ->msi_finish() ? */ - irq_domain_free_irqs_parent(domain, virq, i - 1); + irq_domain_free_irqs_parent(domain, virq, i); return ret; }