From e811c4be132be80ba145f9ea54d4254367ced270 Mon Sep 17 00:00:00 2001
From: derselbst <tom.mbrt@googlemail.com>
Date: Fri, 27 Dec 2024 13:28:04 +0100
Subject: [PATCH] Fix a race condition when loading SF3 files containing
 multiple uncompressed samples

---
 src/sfloader/fluid_sffile.c | 35 ++++++++++++++++++++++++-----------
 1 file changed, 24 insertions(+), 11 deletions(-)

diff --git a/src/sfloader/fluid_sffile.c b/src/sfloader/fluid_sffile.c
index 83594246d..21535c91c 100644
--- a/src/sfloader/fluid_sffile.c
+++ b/src/sfloader/fluid_sffile.c
@@ -669,6 +669,7 @@ static int process_info(SFData *sf, int size)
             sf->version.major = ver;
             READW(sf, ver);
             sf->version.minor = ver;
+            FLUID_LOG(FLUID_DBG, "SF Version: %hu.%hu", sf->version.major, sf->version.minor);
 
             if(sf->version.major < 2)
             {
@@ -710,6 +711,7 @@ static int process_info(SFData *sf, int size)
             sf->romver.major = ver;
             READW(sf, ver);
             sf->romver.minor = ver;
+            FLUID_LOG(FLUID_DBG, "ROM Version: %hu.%hu", sf->version.major, sf->version.minor);
         }
         else if(chunkid(chunk.id) != UNKN_ID)
         {
@@ -2219,21 +2221,23 @@ static int fluid_sffile_read_wav(SFData *sf, unsigned int start, unsigned int en
         goto error_exit;
     }
 
+    fluid_rec_mutex_lock(sf->mtx);
+
     /* Load 16-bit sample data */
     if(sf->fcbs->fseek(sf->sffd, sf->samplepos + (start * sizeof(short)), SEEK_SET) == FLUID_FAILED)
     {
         FLUID_LOG(FLUID_ERR, "Failed to seek to sample position");
-        goto error_exit;
+        goto error_exit_unlock;
     }
 
     loaded_data = FLUID_ARRAY(short, num_samples);
-
     if(loaded_data == NULL)
     {
         FLUID_LOG(FLUID_ERR, "Out of memory");
-        goto error_exit;
+        goto error_exit_unlock;
     }
 
+    FLUID_LOG(FLUID_DBG, "ftell(): %llu, fread(): %ld bytes", sf->fcbs->ftell(sf->sffd), num_samples*sizeof(short));
     if(sf->fcbs->fread(loaded_data, num_samples * sizeof(short), sf->sffd) == FLUID_FAILED)
     {
 #if FLUID_VERSION_CHECK(FLUIDSYNTH_VERSION_MAJOR, FLUIDSYNTH_VERSION_MINOR, FLUIDSYNTH_VERSION_MICRO) < FLUID_VERSION_CHECK(2,2,0)
@@ -2245,9 +2249,11 @@ static int fluid_sffile_read_wav(SFData *sf, unsigned int start, unsigned int en
         }
 #endif
         FLUID_LOG(FLUID_ERR, "Failed to read sample data");
-        goto error_exit;
+        goto error_exit_unlock;
     }
 
+    fluid_rec_mutex_unlock(sf->mtx);
+
     /* If this machine is big endian, byte swap the 16 bit samples */
     if(FLUID_IS_BIG_ENDIAN)
     {
@@ -2272,37 +2278,44 @@ static int fluid_sffile_read_wav(SFData *sf, unsigned int start, unsigned int en
             goto error24_exit;
         }
 
-        if(sf->fcbs->fseek(sf->sffd, sf->sample24pos + start, SEEK_SET) == FLUID_FAILED)
+        loaded_data24 = FLUID_ARRAY(char, num_samples);
+        if(loaded_data24 == NULL)
         {
-            FLUID_LOG(FLUID_ERR, "Failed to seek position for 24-bit sample data in data file");
+            FLUID_LOG(FLUID_ERR, "Out of memory reading 24-bit sample data");
             goto error24_exit;
         }
 
-        loaded_data24 = FLUID_ARRAY(char, num_samples);
+        fluid_rec_mutex_lock(sf->mtx);
 
-        if(loaded_data24 == NULL)
+        if(sf->fcbs->fseek(sf->sffd, sf->sample24pos + start, SEEK_SET) == FLUID_FAILED)
         {
-            FLUID_LOG(FLUID_ERR, "Out of memory reading 24-bit sample data");
-            goto error24_exit;
+            FLUID_LOG(FLUID_ERR, "Failed to seek position for 24-bit sample data in data file");
+            goto error24_exit_unlock;
         }
 
         if(sf->fcbs->fread(loaded_data24, num_samples, sf->sffd) == FLUID_FAILED)
         {
             FLUID_LOG(FLUID_ERR, "Failed to read 24-bit sample data");
-            goto error24_exit;
+            goto error24_exit_unlock;
         }
+
+        fluid_rec_mutex_unlock(sf->mtx);
     }
 
     *data24 = loaded_data24;
 
     return num_samples;
 
+error24_exit_unlock:
+    fluid_rec_mutex_unlock(sf->mtx);
 error24_exit:
     FLUID_LOG(FLUID_WARN, "Ignoring 24-bit sample data, sound quality might suffer");
     FLUID_FREE(loaded_data24);
     *data24 = NULL;
     return num_samples;
 
+error_exit_unlock:
+    fluid_rec_mutex_unlock(sf->mtx);
 error_exit:
     FLUID_FREE(loaded_data);
     FLUID_FREE(loaded_data24);