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genirq/proc: Size interrupt directory names for 10-digit interrupt numbers

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/proc/irq/<n>/ 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 <pengpeng@iscas.ac.cn>
Signed-off-by: Thomas Gleixner <tglx@kernel.org>
Link: https://patch.msgid.link/20260404101001.1-genirq-proc-pengpeng@iscas.ac.cn
This commit is contained in:
Pengpeng Hou 2026-04-03 16:55:56 +08:00 committed by Thomas Gleixner
parent 254f49634e
commit c2c7983c93
1 changed files with 4 additions and 3 deletions
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7
kernel/irq/proc.c
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@ -10,6 +10,7 @@
#include <linux/proc_fs.h>
#include <linux/seq_file.h>
#include <linux/interrupt.h>
#include <linux/kernel.h>
#include <linux/kernel_stat.h>
#include <linux/mutex.h>
#include <linux/string.h>
@ -326,7 +327,7 @@ 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)
{
@ -348,7 +349,7 @@ void register_irq_proc(unsigned int irq, struct irq_desc *desc)
return;
/* create /proc/irq/1234 */
sprintf(name, "%u", irq);
snprintf(name, MAX_NAMELEN, "%u", irq);
desc->dir = proc_mkdir(name, root_irq_dir);
if (!desc->dir)
return;
@ -401,7 +402,7 @@ 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);
}