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CBL-Mariner/SPECS/grub2/0183-video-readers-jpeg-Abo...

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From 5e394e17cf44fa46be915ceb9a7026778f86626e Mon Sep 17 00:00:00 2001
From: Daniel Axtens <dja@axtens.net>
Date: Mon, 28 Jun 2021 14:16:14 +1000
Subject: [PATCH] video/readers/jpeg: Abort sooner if a read operation fails
Fuzzing revealed some inputs that were taking a long time, potentially
forever, because they did not bail quickly upon encountering an I/O error.
Try to catch I/O errors sooner and bail out.
Signed-off-by: Daniel Axtens <dja@axtens.net>
Reviewed-by: Daniel Kiper <daniel.kiper@oracle.com>
---
grub-core/video/readers/jpeg.c | 86 +++++++++++++++++++++++++++-------
1 file changed, 70 insertions(+), 16 deletions(-)
diff --git a/grub-core/video/readers/jpeg.c b/grub-core/video/readers/jpeg.c
index e31602f..10225ab 100644
--- a/grub-core/video/readers/jpeg.c
+++ b/grub-core/video/readers/jpeg.c
@@ -109,9 +109,17 @@ static grub_uint8_t
grub_jpeg_get_byte (struct grub_jpeg_data *data)
{
grub_uint8_t r;
+ grub_ssize_t bytes_read;
r = 0;
- grub_file_read (data->file, &r, 1);
+ bytes_read = grub_file_read (data->file, &r, 1);
+
+ if (bytes_read != 1)
+ {
+ grub_error (GRUB_ERR_BAD_FILE_TYPE,
+ "jpeg: unexpected end of data");
+ return 0;
+ }
return r;
}
@@ -120,9 +128,17 @@ static grub_uint16_t
grub_jpeg_get_word (struct grub_jpeg_data *data)
{
grub_uint16_t r;
+ grub_ssize_t bytes_read;
r = 0;
- grub_file_read (data->file, &r, sizeof (grub_uint16_t));
+ bytes_read = grub_file_read (data->file, &r, sizeof (grub_uint16_t));
+
+ if (bytes_read != sizeof (grub_uint16_t))
+ {
+ grub_error (GRUB_ERR_BAD_FILE_TYPE,
+ "jpeg: unexpected end of data");
+ return 0;
+ }
return grub_be_to_cpu16 (r);
}
@@ -135,6 +151,11 @@ grub_jpeg_get_bit (struct grub_jpeg_data *data)
if (data->bit_mask == 0)
{
data->bit_save = grub_jpeg_get_byte (data);
+ if (grub_errno != GRUB_ERR_NONE) {
+ grub_error (GRUB_ERR_BAD_FILE_TYPE,
+ "jpeg: file read error");
+ return 0;
+ }
if (data->bit_save == JPEG_ESC_CHAR)
{
if (grub_jpeg_get_byte (data) != 0)
@@ -143,6 +164,11 @@ grub_jpeg_get_bit (struct grub_jpeg_data *data)
"jpeg: invalid 0xFF in data stream");
return 0;
}
+ if (grub_errno != GRUB_ERR_NONE)
+ {
+ grub_error (GRUB_ERR_BAD_FILE_TYPE, "jpeg: file read error");
+ return 0;
+ }
}
data->bit_mask = 0x80;
}
@@ -161,7 +187,7 @@ grub_jpeg_get_number (struct grub_jpeg_data *data, int num)
return 0;
msb = value = grub_jpeg_get_bit (data);
- for (i = 1; i < num; i++)
+ for (i = 1; i < num && grub_errno == GRUB_ERR_NONE; i++)
value = (value << 1) + (grub_jpeg_get_bit (data) != 0);
if (!msb)
value += 1 - (1 << num);
@@ -202,6 +228,8 @@ grub_jpeg_decode_huff_table (struct grub_jpeg_data *data)
while (data->file->offset + sizeof (count) + 1 <= next_marker)
{
id = grub_jpeg_get_byte (data);
+ if (grub_errno != GRUB_ERR_NONE)
+ return grub_errno;
ac = (id >> 4) & 1;
id &= 0xF;
if (id > 1)
@@ -252,6 +280,8 @@ grub_jpeg_decode_quan_table (struct grub_jpeg_data *data)
next_marker = data->file->offset;
next_marker += grub_jpeg_get_word (data);
+ if (grub_errno != GRUB_ERR_NONE)
+ return grub_errno;
if (next_marker > data->file->size)
{
@@ -263,6 +293,8 @@ grub_jpeg_decode_quan_table (struct grub_jpeg_data *data)
<= next_marker)
{
id = grub_jpeg_get_byte (data);
+ if (grub_errno != GRUB_ERR_NONE)
+ return grub_errno;
if (id >= 0x10) /* Upper 4-bit is precision. */
return grub_error (GRUB_ERR_BAD_FILE_TYPE,
"jpeg: only 8-bit precision is supported");
@@ -294,6 +326,9 @@ grub_jpeg_decode_sof (struct grub_jpeg_data *data)
next_marker = data->file->offset;
next_marker += grub_jpeg_get_word (data);
+ if (grub_errno != GRUB_ERR_NONE)
+ return grub_errno;
+
if (grub_jpeg_get_byte (data) != 8)
return grub_error (GRUB_ERR_BAD_FILE_TYPE,
"jpeg: only 8-bit precision is supported");
@@ -319,6 +354,8 @@ grub_jpeg_decode_sof (struct grub_jpeg_data *data)
return grub_error (GRUB_ERR_BAD_FILE_TYPE, "jpeg: invalid index");
ss = grub_jpeg_get_byte (data); /* Sampling factor. */
+ if (grub_errno != GRUB_ERR_NONE)
+ return grub_errno;
if (!id)
{
grub_uint8_t vs, hs;
@@ -498,7 +535,7 @@ grub_jpeg_idct_transform (jpeg_data_unit_t du)
}
}
-static void
+static grub_err_t
grub_jpeg_decode_du (struct grub_jpeg_data *data, int id, jpeg_data_unit_t du)
{
int h1, h2, qt;
@@ -513,6 +550,9 @@ grub_jpeg_decode_du (struct grub_jpeg_data *data, int id, jpeg_data_unit_t du)
data->dc_value[id] +=
grub_jpeg_get_number (data, grub_jpeg_get_huff_code (data, h1));
+ if (grub_errno != GRUB_ERR_NONE)
+ return grub_errno;
+
du[0] = data->dc_value[id] * (int) data->quan_table[qt][0];
pos = 1;
while (pos < ARRAY_SIZE (data->quan_table[qt]))
@@ -527,11 +567,13 @@ grub_jpeg_decode_du (struct grub_jpeg_data *data, int id, jpeg_data_unit_t du)
num >>= 4;
pos += num;
+ if (grub_errno != GRUB_ERR_NONE)
+ return grub_errno;
+
if (pos >= ARRAY_SIZE (jpeg_zigzag_order))
{
- grub_error (GRUB_ERR_BAD_FILE_TYPE,
- "jpeg: invalid position in zigzag order!?");
- return;
+ return grub_error (GRUB_ERR_BAD_FILE_TYPE,
+ "jpeg: invalid position in zigzag order!?");
}
du[jpeg_zigzag_order[pos]] = val * (int) data->quan_table[qt][pos];
@@ -539,6 +581,7 @@ grub_jpeg_decode_du (struct grub_jpeg_data *data, int id, jpeg_data_unit_t du)
}
grub_jpeg_idct_transform (du);
+ return GRUB_ERR_NONE;
}
static void
@@ -597,7 +640,8 @@ grub_jpeg_decode_sos (struct grub_jpeg_data *data)
data_offset += grub_jpeg_get_word (data);
cc = grub_jpeg_get_byte (data);
-
+ if (grub_errno != GRUB_ERR_NONE)
+ return grub_errno;
if (cc != 3 && cc != 1)
return grub_error (GRUB_ERR_BAD_FILE_TYPE,
"jpeg: component count must be 1 or 3");
@@ -610,7 +654,8 @@ grub_jpeg_decode_sos (struct grub_jpeg_data *data)
id = grub_jpeg_get_byte (data) - 1;
if ((id < 0) || (id >= 3))
return grub_error (GRUB_ERR_BAD_FILE_TYPE, "jpeg: invalid index");
-
+ if (grub_errno != GRUB_ERR_NONE)
+ return grub_errno;
ht = grub_jpeg_get_byte (data);
data->comp_index[id][1] = (ht >> 4);
data->comp_index[id][2] = (ht & 0xF) + 2;
@@ -618,11 +663,14 @@ grub_jpeg_decode_sos (struct grub_jpeg_data *data)
if ((data->comp_index[id][1] < 0) || (data->comp_index[id][1] > 3) ||
(data->comp_index[id][2] < 0) || (data->comp_index[id][2] > 3))
return grub_error (GRUB_ERR_BAD_FILE_TYPE, "jpeg: invalid hufftable index");
+ if (grub_errno != GRUB_ERR_NONE)
+ return grub_errno;
}
grub_jpeg_get_byte (data); /* Skip 3 unused bytes. */
grub_jpeg_get_word (data);
-
+ if (grub_errno != GRUB_ERR_NONE)
+ return grub_errno;
if (data->file->offset != data_offset)
return grub_error (GRUB_ERR_BAD_FILE_TYPE, "jpeg: extra byte in sos");
@@ -640,6 +688,7 @@ grub_jpeg_decode_data (struct grub_jpeg_data *data)
{
unsigned c1, vb, hb, nr1, nc1;
int rst = data->dri;
+ grub_err_t err = GRUB_ERR_NONE;
vb = 8 << data->log_vs;
hb = 8 << data->log_hs;
@@ -660,17 +709,22 @@ grub_jpeg_decode_data (struct grub_jpeg_data *data)
for (r2 = 0; r2 < (1U << data->log_vs); r2++)
for (c2 = 0; c2 < (1U << data->log_hs); c2++)
- grub_jpeg_decode_du (data, 0, data->ydu[r2 * 2 + c2]);
+ {
+ err = grub_jpeg_decode_du (data, 0, data->ydu[r2 * 2 + c2]);
+ if (err != GRUB_ERR_NONE)
+ return err;
+ }
if (data->color_components >= 3)
{
- grub_jpeg_decode_du (data, 1, data->cbdu);
- grub_jpeg_decode_du (data, 2, data->crdu);
+ err = grub_jpeg_decode_du (data, 1, data->cbdu);
+ if (err != GRUB_ERR_NONE)
+ return err;
+ err = grub_jpeg_decode_du (data, 2, data->crdu);
+ if (err != GRUB_ERR_NONE)
+ return err;
}
- if (grub_errno)
- return grub_errno;
-
nr2 = (data->r1 == nr1 - 1) ? (data->image_height - data->r1 * vb) : vb;
nc2 = (c1 == nc1 - 1) ? (data->image_width - c1 * hb) : hb;
--
2.34.1
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