From 01b2969a8528b926f5e4d98161ae37053234475c Mon Sep 17 00:00:00 2001 From: Chuck Lever Date: Fri, 26 Oct 2007 13:31:20 -0400 Subject: [PATCH] SUNRPC: Prevent length underflow in read_flush() Make sure we compare an unsigned length to an unsigned count in read_flush(). Signed-off-by: Chuck Lever Signed-off-by: J. Bruce Fields --- net/sunrpc/cache.c | 10 +++++----- 1 file changed, 5 insertions(+), 5 deletions(-) diff --git a/net/sunrpc/cache.c b/net/sunrpc/cache.c index 73f053d0cc7a..d27bbe0ee907 100644 --- a/net/sunrpc/cache.c +++ b/net/sunrpc/cache.c @@ -1244,18 +1244,18 @@ static ssize_t read_flush(struct file *file, char __user *buf, struct cache_detail *cd = PDE(file->f_path.dentry->d_inode)->data; char tbuf[20]; unsigned long p = *ppos; - int len; + size_t len; sprintf(tbuf, "%lu\n", cd->flush_time); len = strlen(tbuf); if (p >= len) return 0; len -= p; - if (len > count) len = count; + if (len > count) + len = count; if (copy_to_user(buf, (void*)(tbuf+p), len)) - len = -EFAULT; - else - *ppos += len; + return -EFAULT; + *ppos += len; return len; } -- 2.20.1