From: Stefan Hajnoczi <stefanha@xxxxxxxxxx>
3.12-stable review patch. If anyone has any objections, please let me know.
===============
commit b7052cd7bcf3c1478796e93e3dff2b44c9e82943 upstream.
The qword_get() function NUL-terminates its output buffer. If the input
string is in hex format \xXXXX... and the same length as the output
buffer, there is an off-by-one:
int qword_get(char **bpp, char *dest, int bufsize)
{
...
while (len < bufsize) {
...
*dest++ = (h << 4) | l;
len++;
}
...
*dest = '\0';
return len;
}
This patch ensures the NUL terminator doesn't fall outside the output
buffer.
Signed-off-by: Stefan Hajnoczi <stefanha@xxxxxxxxxx>
Signed-off-by: J. Bruce Fields <bfields@xxxxxxxxxx>
Signed-off-by: Jiri Slaby <jslaby@xxxxxxx>
---
net/sunrpc/cache.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/net/sunrpc/cache.c b/net/sunrpc/cache.c
index 8a6e3b0d25d4..f3e2b7d8f325 100644
--- a/net/sunrpc/cache.c
+++ b/net/sunrpc/cache.c
@@ -1232,7 +1232,7 @@ int qword_get(char **bpp, char *dest, int bufsize)
if (bp[0] == '\\' && bp[1] == 'x') {
/* HEX STRING */
bp += 2;
- while (len < bufsize) {
+ while (len < bufsize - 1) {
int h, l;
h = hex_to_bin(bp[0]);
--
2.7.2
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