bmv: fix apparent sign error in the frame_off check

Fixes part of Ticket1373 Signed-off-by: Michael Niedermayer <michaelni@gmx.at>

bmv: fix apparent sign error in the frame_off check
Fixes part of Ticket1373 Signed-off-by: Michael Niedermayer <michaelni@gmx.at>
debbcfae · Michael Niedermayer · 679c578c · debbcfae
Commit debbcfae authored Jun 02, 2012 by Michael Niedermayer
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Showing with 2 additions and 2 deletions

bmv.c libavcodec/bmv.c +2 -2

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--- a/libavcodec/bmv.c
+++ b/libavcodec/bmv.c
@@ -143,7 +143,7 @@ static int decode_bmv_frame(const uint8_t *source, int src_len, uint8_t *frame,
        switch (mode) {
        case 1:
            if (forward) {
-                if (dst - frame + SCREEN_WIDE < frame_off ||
+                if (dst - frame + SCREEN_WIDE < -frame_off ||
                        frame_end - dst < frame_off + len)
                    return -1;
                for (i = 0; i < len; i++)
@@ -151,7 +151,7 @@ static int decode_bmv_frame(const uint8_t *source, int src_len, uint8_t *frame,
                dst += len;
            } else {
                dst -= len;
-                if (dst - frame + SCREEN_WIDE < frame_off ||
+                if (dst - frame + SCREEN_WIDE < -frame_off ||
                        frame_end - dst < frame_off + len)
                    return -1;
                for (i = len - 1; i >= 0; i--)