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From 0000000000000000000000000000000000000000 Mon Sep 17 00:00:00 2001
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From: Daniel Axtens <dja@axtens.net>
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Date: Mon, 28 Jun 2021 14:25:17 +1000
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Subject: [PATCH] video/readers/jpeg: Refuse to handle multiple start of
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streams
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An invalid file could contain multiple start of stream blocks, which
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would cause us to reallocate and leak our bitmap. Refuse to handle
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multiple start of streams.
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Additionally, fix a grub_error() call formatting.
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Signed-off-by: Daniel Axtens <dja@axtens.net>
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Reviewed-by: Daniel Kiper <daniel.kiper@oracle.com>
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(cherry picked from commit f3a854def3e281b7ad4bbea730cd3046de1da52f)
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---
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grub-core/video/readers/jpeg.c | 7 +++++--
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1 file changed, 5 insertions(+), 2 deletions(-)
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diff --git a/grub-core/video/readers/jpeg.c b/grub-core/video/readers/jpeg.c
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index caa211f06d..1df1171d78 100644
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--- a/grub-core/video/readers/jpeg.c
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+++ b/grub-core/video/readers/jpeg.c
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@@ -677,6 +677,9 @@ grub_jpeg_decode_sos (struct grub_jpeg_data *data)
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if (data->file->offset != data_offset)
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return grub_error (GRUB_ERR_BAD_FILE_TYPE, "jpeg: extra byte in sos");
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+ if (*data->bitmap)
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+ return grub_error (GRUB_ERR_BAD_FILE_TYPE, "jpeg: too many start of scan blocks");
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+
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if (grub_video_bitmap_create (data->bitmap, data->image_width,
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data->image_height,
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GRUB_VIDEO_BLIT_FORMAT_RGB_888))
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@@ -699,8 +702,8 @@ grub_jpeg_decode_data (struct grub_jpeg_data *data)
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nc1 = (data->image_width + hb - 1) >> (3 + data->log_hs);
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if (data->bitmap_ptr == NULL)
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- return grub_error(GRUB_ERR_BAD_FILE_TYPE,
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- "jpeg: attempted to decode data before start of stream");
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+ return grub_error (GRUB_ERR_BAD_FILE_TYPE,
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+ "jpeg: attempted to decode data before start of stream");
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for (; data->r1 < nr1 && (!data->dri || rst);
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data->r1++, data->bitmap_ptr += (vb * data->image_width - hb * nc1) * 3)
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