LibJpeg gets stuck in jpeg_start_decompress(&cinfo)

[Giovanni3]

Hi, I'm using an STM32F746bgt6 on a custom board, and I'm using Keil.
I enabled LibJpeg in CubeMX, but I can't get an RGB JPEG.
I have a .jpeg file saved in flash, "frame99.jpg," which I read via littlefs. When I read it, I allocate the buffer to external SDRAM.

int ReadFileSDRAM(lfs_t *lfs, const char *filename)
{	
	lfs_file_t file;
	int res = lfs_file_open(lfs, &file, filename, LFS_O_RDONLY);
	if (res < 0)
	{
		printf("Errore apertura file in lettura\n");
		return -1;
	}
	lfs_soff_t size = lfs_file_size(lfs, &file);
	if (size <= 0 || size > SDRAM_SIZE_BYTES)
	{
		printf("File vuoto, troppo grande o errore lettura dimensione\n");
		lfs_file_close(lfs, &file);
		return -2;
	}	
	res = lfs_file_read(lfs, &file, image_buffer, size);
	if (res < 0)
	{
		printf("Errore lettura file errore = %d\n", res);
		lfs_file_close(lfs, &file);
		return -3;
	}
	uint16_t sample_u = 0;
	int16_t sample_s = 0;
	image_size1 = size;  
	while (image_size1 > 0 && image_buffer[image_size1 - 1] == 0xFF)
	{
          image_size1--;
	}
	lfs_file_close(lfs, &file);
	return (int)size;
}

While the decompression part is

ReadFileSDRAM(&lfs_gd, "frame99.jpg");
		int width, height;
		int ret = DecodeJPEGtoRGB565_Static(image_buffer, image_size1,	image_rgb, &image_size2,	&width, &height);

		if (ret != 0) {
				printf("[JPEG] ERROR  JPEG: %d\n", ret);
		} else {
				printf("[JPEG] OK, width=%d, height=%d, size=%lu\n",
							 width, height, image_size2);
		}


int DecodeJPEGtoRGB565(uint8_t *jpeg_data, size_t jpeg_size, uint8_t *rgb565_buffer, uint32_t *out_size, int *width, int *height)
{
    struct jpeg_decompress_struct cinfo;
    struct jpeg_error_mgr jerr;

    printf("[JPEG] Starting decode, size = %lu bytes\n", (unsigned long)jpeg_size);

    cinfo.err = jpeg_std_error(&jerr);
    jpeg_create_decompress(&cinfo);
    
    // jpeg_mem_src(&cinfo, jpeg_data, jpeg_size); // Original
    jpeg_memory_src(&cinfo, jpeg_data, jpeg_size);

    if (jpeg_read_header(&cinfo, TRUE) != JPEG_HEADER_OK) 
    {
        printf("[JPEG] Error: invalid JPEG header!\n");
        jpeg_destroy_decompress(&cinfo);
        return -1;
    }
    printf("[JPEG] Header successfully read\n");

    jpeg_start_decompress(&cinfo);
    *width  = cinfo.output_width;
    *height = cinfo.output_height;
    printf("[JPEG] Image dimensions: %dx%d, components = %d\n", *width, *height, cinfo.output_components);

    int row_stride = cinfo.output_width * cinfo.output_components;
    uint8_t *row_buffer = (uint8_t *)malloc(row_stride);
    if (!row_buffer) 
    {
        printf("[JPEG] Error: malloc failed for row_buffer (%d bytes)\n", row_stride);
        jpeg_finish_decompress(&cinfo);
        jpeg_destroy_decompress(&cinfo);
        return -2;
    }
    
    printf("[JPEG] Allocated row_buffer of %d bytes\n", row_stride);

    uint16_t *pDst = (uint16_t *)rgb565_buffer;
    while (cinfo.output_scanline < cinfo.output_height) 
    {
        jpeg_read_scanlines(&cinfo, &row_buffer, 1);
        int y = cinfo.output_scanline - 1; // just read row
        for (int i = 0; i < cinfo.output_width; i++) 
        {
            uint8_t r = row_buffer[i * 3 + 0];
            uint8_t g = row_buffer[i * 3 + 1];
            uint8_t b = row_buffer[i * 3 + 2];
            *pDst++ = ((r & 0xF8) << 8) |
                      ((g & 0xFC) << 3) |
                      ((b & 0xF8) >> 3);
        }
        // debug print every 50 rows
        if ((y % 50) == 0) 
        {
            printf("[JPEG] Decoded scanline %d/%d\n", y + 1, *height);
        }
    }

    free(row_buffer);
    jpeg_finish_decompress(&cinfo);
    jpeg_destroy_decompress(&cinfo);

    *out_size = (*width) * (*height) * 2;  // 2 bytes per RGB565 pixel
    printf("[JPEG] Decoding completed: final buffer size = %lu bytes\n", (unsigned long)(*out_size));

    return 0; // success
}

the code gets stuck in " jpeg_start_decompress(&cinfo); "
I followed it with the print and it gets stuck in - > main = (my_main_ptr)
(*cinfo->mem->alloc_small)((j_common_ptr)cinfo, JPOOL_IMAGE,
SIZEOF(my_main_controller)); 
how can i solve it? 
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