[FFmpeg-cvslog] lavfi/overlay: fix crash in case of invalid expression
Stefano Sabatini
git at videolan.org
Fri Apr 12 00:20:36 CEST 2013
ffmpeg | branch: master | Stefano Sabatini <stefasab at gmail.com> | Thu Apr 11 23:54:24 2013 +0200| [aff6cebb41669a25008f76ce3c310001613e6263] | committer: Stefano Sabatini
lavfi/overlay: fix crash in case of invalid expression
> http://git.videolan.org/gitweb.cgi/ffmpeg.git/?a=commit;h=aff6cebb41669a25008f76ce3c310001613e6263
---
libavfilter/vf_overlay.c | 13 +++++++++----
1 file changed, 9 insertions(+), 4 deletions(-)
diff --git a/libavfilter/vf_overlay.c b/libavfilter/vf_overlay.c
index 5ac114a..b5c3f6f 100644
--- a/libavfilter/vf_overlay.c
+++ b/libavfilter/vf_overlay.c
@@ -170,16 +170,21 @@ static void eval_expr(AVFilterContext *ctx, enum EvalTarget eval_tgt)
static int set_expr(AVExpr **pexpr, const char *expr, void *log_ctx)
{
int ret;
+ AVExpr *old = NULL;
if (*pexpr)
- av_expr_free(*pexpr);
- *pexpr = NULL;
+ old = *pexpr;
ret = av_expr_parse(pexpr, expr, var_names,
NULL, NULL, NULL, NULL, 0, log_ctx);
- if (ret < 0)
+ if (ret < 0) {
av_log(log_ctx, AV_LOG_ERROR,
"Error when evaluating the expression '%s'\n", expr);
- return ret;
+ *pexpr = old;
+ return ret;
+ }
+
+ av_expr_free(old);
+ return 0;
}
static int process_command(AVFilterContext *ctx, const char *cmd, const char *args,
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