commit 2d0204485a30446d82770c115e0a4d61e2819f23
author Yannis Guyon <yguyon@google.com> Tue Apr 22 12:53:53 2025 +0000
committer GitHub <noreply@github.com> Tue Apr 22 14:53:53 2025 +0200
tree 4d29c14588cf1f16087e3b485a34854ac5995e82
parent 55eef9035dbaec9f36d8218462a2e256dfebd8e9

Check ftell returned value in avifjpeg.c (#2773)

apps/shared/avifjpeg.c

diff --git a/apps/shared/avifjpeg.c b/apps/shared/avifjpeg.c
index f8fb102..cddf8ca 100644
--- a/apps/shared/avifjpeg.c
+++ b/apps/shared/avifjpeg.c
@@ -353,6 +353,9 @@
 static avifBool avifJPEGFindMpfSegmentOffset(FILE * f, uint32_t * mpfOffset)
 {
     const long oldOffset = ftell(f);
+    if (oldOffset < 0) {
+        return AVIF_FALSE;
+    }
 
     uint32_t offset = 2; // Skip the 2 byte SOI (Start Of Image) marker.
     if (fseek(f, offset, SEEK_SET) != 0) {