[PULL,2/3] vnc-enc-tight: fix off-by-one bug
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Message ID 1468913298-23781-3-git-send-email-kraxel@redhat.com
State New
Headers show

Commit Message

Gerd Hoffmann July 19, 2016, 7:28 a.m. UTC
From: "Herongguang (Stephen)" <herongguang.he@huawei.com>

In tight_encode_indexed_rect32, buf(or src)’s size is count. In for loop,
the logic is supposed to be that i is an index into src, i should be
incremented when incrementing src.

This is broken when src is incremented but i is not before while loop,
resulting in off-by-one bug in while loop.

Signed-off-by: He Rongguang <herongguang.he@huawei.com>
Message-id: 5784B8EB.7010008@huawei.com
Signed-off-by: Gerd Hoffmann <kraxel@redhat.com>
---
 ui/vnc-enc-tight.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

Patch
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diff --git a/ui/vnc-enc-tight.c b/ui/vnc-enc-tight.c
index b8581dd..877c093 100644
--- a/ui/vnc-enc-tight.c
+++ b/ui/vnc-enc-tight.c
@@ -461,9 +461,10 @@  static int tight_fill_palette(VncState *vs, int x, int y,
                                                                         \
         src = (uint##bpp##_t *) buf;                                    \
                                                                         \
-        for (i = 0; i < count; i++) {                                   \
+        for (i = 0; i < count; ) {                                      \
                                                                         \
             rgb = *src++;                                               \
+            i++;                                                        \
             rep = 0;                                                    \
             while (i < count && *src == rgb) {                          \
                 rep++, src++, i++;                                      \