1 files changed, 57 insertions, 8 deletions

diff --git a/kernel/sysctl.c b/kernel/sysctl.c
index 4a13a389e99b..557d46728577 100644
--- a/kernel/sysctl.c
+++ b/kernel/sysctl.c
@@ -66,6 +66,7 @@
 #include <linux/kexec.h>
 #include <linux/bpf.h>
 #include <linux/mount.h>
+#include <linux/pipe_fs_i.h>
 
 #include <linux/uaccess.h>
 #include <asm/processor.h>
@@ -1816,7 +1817,7 @@ static struct ctl_table fs_table[] = {
 	{
 		.procname	= "pipe-max-size",
 		.data		= &pipe_max_size,
-		.maxlen		= sizeof(int),
+		.maxlen		= sizeof(pipe_max_size),
 		.mode		= 0644,
 		.proc_handler	= &pipe_proc_fn,
 		.extra1		= &pipe_min_size,
@@ -2575,12 +2576,13 @@ static int do_proc_douintvec_minmax_conv(unsigned long *lvalp,
 	if (write) {
 		unsigned int val = *lvalp;
 
+		if (*lvalp > UINT_MAX)
+			return -EINVAL;
+
 		if ((param->min && *param->min > val) ||
 		    (param->max && *param->max < val))
 			return -ERANGE;
 
-		if (*lvalp > UINT_MAX)
-			return -EINVAL;
 		*valp = val;
 	} else {
 		unsigned int val = *valp;
@@ -2620,6 +2622,48 @@ int proc_douintvec_minmax(struct ctl_table *table, int write,
 				 do_proc_douintvec_minmax_conv, &param);
 }
 
+struct do_proc_dopipe_max_size_conv_param {
+	unsigned int *min;
+};
+
+static int do_proc_dopipe_max_size_conv(unsigned long *lvalp,
+					unsigned int *valp,
+					int write, void *data)
+{
+	struct do_proc_dopipe_max_size_conv_param *param = data;
+
+	if (write) {
+		unsigned int val;
+
+		if (*lvalp > UINT_MAX)
+			return -EINVAL;
+
+		val = round_pipe_size(*lvalp);
+		if (val == 0)
+			return -EINVAL;
+
+		if (param->min && *param->min > val)
+			return -ERANGE;
+
+		*valp = val;
+	} else {
+		unsigned int val = *valp;
+		*lvalp = (unsigned long) val;
+	}
+
+	return 0;
+}
+
+int proc_dopipe_max_size(struct ctl_table *table, int write,
+			 void __user *buffer, size_t *lenp, loff_t *ppos)
+{
+	struct do_proc_dopipe_max_size_conv_param param = {
+		.min = (unsigned int *) table->extra1,
+	};
+	return do_proc_douintvec(table, write, buffer, lenp, ppos,
+				 do_proc_dopipe_max_size_conv, &param);
+}
+
 static void validate_coredump_safety(void)
 {
 #ifdef CONFIG_COREDUMP
@@ -3083,14 +3127,12 @@ int proc_do_large_bitmap(struct ctl_table *table, int write,
 			else
 				bitmap_copy(bitmap, tmp_bitmap, bitmap_len);
 		}
-		kfree(tmp_bitmap);
 		*lenp -= left;
 		*ppos += *lenp;
-		return 0;
-	} else {
-		kfree(tmp_bitmap);
-		return err;
 	}
+
+	kfree(tmp_bitmap);
+	return err;
 }
 
 #else /* CONFIG_PROC_SYSCTL */
@@ -3125,6 +3167,12 @@ int proc_douintvec_minmax(struct ctl_table *table, int write,
 	return -ENOSYS;
 }
 
+int proc_dopipe_max_size(struct ctl_table *table, int write,
+			 void __user *buffer, size_t *lenp, loff_t *ppos)
+{
+	return -ENOSYS;
+}
+
 int proc_dointvec_jiffies(struct ctl_table *table, int write,
 		    void __user *buffer, size_t *lenp, loff_t *ppos)
 {
@@ -3168,6 +3216,7 @@ EXPORT_SYMBOL(proc_douintvec);
 EXPORT_SYMBOL(proc_dointvec_jiffies);
 EXPORT_SYMBOL(proc_dointvec_minmax);
 EXPORT_SYMBOL_GPL(proc_douintvec_minmax);
+EXPORT_SYMBOL_GPL(proc_dopipe_max_size);
 EXPORT_SYMBOL(proc_dointvec_userhz_jiffies);
 EXPORT_SYMBOL(proc_dointvec_ms_jiffies);
 EXPORT_SYMBOL(proc_dostring);