Re: 2.6.17-mm2

[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]

 



Andrew Morton wrote:
On Wed, 28 Jun 2006 03:42:15 -0700
Andrew Morton <[email protected]> wrote:


his is caused by the vsprintf() changes.  Right now, if you do

	snprintf(buf, 4, "1111111111111");

the memory at `buf' gets [31 31 31 31 00], which is not good.

This'll plug it, but I didn't check very hard whether it still has any
off-by-ones, or if breaks the intent of Jeremy's patch.  I think it's OK..

Aha, you're a genius! How the hell did you figure that one out?

Andy / Steve ... any chance one of you could kick this through the
harness? Against -git10 or so, I'd think

Thanks,

M.

That diff was against an older kernel and doesn't apply.  This is against
mainline:

--- a/lib/vsprintf.c~vsnprintf-fix
+++ a/lib/vsprintf.c
@@ -259,7 +259,9 @@ int vsnprintf(char *buf, size_t size, co
 	int len;
 	unsigned long long num;
 	int i, base;
-	char *str, *end, c;
+	char *str;		/* Where we're writing to */
+	char *end;		/* The last byte we can write to */
+	char c;
 	const char *s;
int flags; /* flags to number() */
@@ -283,12 +285,12 @@ int vsnprintf(char *buf, size_t size, co
 	}
str = buf;
-	end = buf + size;
+	end = buf + size - 1;
/* Make sure end is always >= buf */
-	if (end < buf) {
+	if (end < buf - 1) {
 		end = ((void *)-1);
-		size = end - buf;
+		size = end - buf + 1;
 	}
for (; *fmt ; ++fmt) {
@@ -494,7 +496,6 @@ int vsnprintf(char *buf, size_t size, co
 	/* the trailing null byte doesn't count towards the total */
 	return str-buf;
 }
-
 EXPORT_SYMBOL(vsnprintf);
/**
_


-
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to [email protected]
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/

[Index of Archives]     [Kernel Newbies]     [Netfilter]     [Bugtraq]     [Photo]     [Stuff]     [Gimp]     [Yosemite News]     [MIPS Linux]     [ARM Linux]     [Linux Security]     [Linux RAID]     [Video 4 Linux]     [Linux for the blind]     [Linux Resources]
  Powered by Linux