[PATCH] modpost: fix buffer overflow

[Jiri Benc]

I got SIGABRT in modpost when building a module really deeply nested in
a filesystem (path > 100 chars):

>   Building modules, stage 2.
>   MODPOST
> *** glibc detected *** scripts/mod/modpost: realloc(): invalid next size: 0x0809f588 ***
> [...]

This patch fixes that problem.

Signed-off-by: Jiri Benc <jbenc@xxxxxxx>

--- linux-2.6.16-rc6.orig/scripts/mod/modpost.c
+++ linux-2.6.16-rc6/scripts/mod/modpost.c
@@ -552,7 +552,7 @@ void __attribute__((format(printf, 2, 3)
 	
 	va_start(ap, fmt);
 	len = vsnprintf(tmp, SZ, fmt, ap);
-	if (buf->size - buf->pos < len + 1) {
+	while (buf->size - buf->pos < len + 1) {
 		buf->size += 128;
 		buf->p = realloc(buf->p, buf->size);
 	}


-- 
Jiri Benc
SUSE Labs
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