6.6-stable review patch. If anyone has any objections, please let me know. ------------------ From: Pengpeng Hou [ Upstream commit c2c7983c93f5d86962318be7e7298f1bc3feb1a6 ] /proc/irq// directory names are built in `char name[10]` buffers with `sprintf(name, "%u", irq)`. Ten-digit IRQ numbers already need 11 bytes including the trailing NUL, and current sparse-IRQ configurations allow interrupt numbers in that range. Size the temporary name buffer for the current decimal form and switch to bounded formatting when creating or removing the proc entry. Signed-off-by: Pengpeng Hou Signed-off-by: Thomas Gleixner Link: https://patch.msgid.link/20260404101001.1-genirq-proc-pengpeng@iscas.ac.cn Signed-off-by: Sasha Levin --- kernel/irq/proc.c | 7 ++++--- 1 file changed, 4 insertions(+), 3 deletions(-) diff --git a/kernel/irq/proc.c b/kernel/irq/proc.c index 623b8136e9af3..1dccdbbd76970 100644 --- a/kernel/irq/proc.c +++ b/kernel/irq/proc.c @@ -10,6 +10,7 @@ #include #include #include +#include #include #include @@ -333,7 +334,7 @@ void register_handler_proc(unsigned int irq, struct irqaction *action) #undef MAX_NAMELEN -#define MAX_NAMELEN 10 +#define MAX_NAMELEN 11 void register_irq_proc(unsigned int irq, struct irq_desc *desc) { @@ -354,7 +355,7 @@ void register_irq_proc(unsigned int irq, struct irq_desc *desc) if (desc->dir) goto out_unlock; - sprintf(name, "%d", irq); + snprintf(name, MAX_NAMELEN, "%u", irq); /* create /proc/irq/1234 */ desc->dir = proc_mkdir(name, root_irq_dir); @@ -408,7 +409,7 @@ void unregister_irq_proc(unsigned int irq, struct irq_desc *desc) #endif remove_proc_entry("spurious", desc->dir); - sprintf(name, "%u", irq); + snprintf(name, MAX_NAMELEN, "%u", irq); remove_proc_entry(name, root_irq_dir); } -- 2.53.0