[FFmpeg-cvslog] swresample/resample: Limit filter length

[Michael Niedermayer]

ffmpeg | branch: master | Michael Niedermayer <michaelni at gmx.at> | Tue Apr  8 00:19:07 2014 +0200| [f9158b01d0f3effb58e87fb07db0382bc1e47de5] | committer: Michael Niedermayer

swresample/resample: Limit filter length

Related to CID1197063

The limit choosen is arbitrary and much larger than what makes sense.
It avoids the need for checking arithmetic operations with the length for overflow

Signed-off-by: Michael Niedermayer <michaelni at gmx.at>

> http://git.videolan.org/gitweb.cgi/ffmpeg.git/?a=commit;h=f9158b01d0f3effb58e87fb07db0382bc1e47de5
---

 libswresample/resample.c |    5 +++++
 1 file changed, 5 insertions(+)

diff --git a/libswresample/resample.c b/libswresample/resample.c
index 581382f..77653a7 100644
--- a/libswresample/resample.c
+++ b/libswresample/resample.c
@@ -229,6 +229,11 @@ static ResampleContext *resample_init(ResampleContext *c, int out_rate, int in_r
             av_assert0(0);
         }
 
+        if (filter_size/factor > INT32_MAX/256) {
+            av_log(NULL, AV_LOG_ERROR, "Filter length too large\n");
+            goto error;
+        }
+
         c->phase_shift   = phase_shift;
         c->phase_mask    = phase_count - 1;
         c->linear        = linear;