* [PATCH v2] media: vicodec: ensure comp frame pointer kept in range
@ 2019-01-24 9:51 Dafna Hirschfeld
0 siblings, 0 replies; only message in thread
From: Dafna Hirschfeld @ 2019-01-24 9:51 UTC (permalink / raw)
To: linux-media; +Cc: hverkuil, helen.koike, Dafna Hirschfeld
Make sure that the pointer to the compressed frame does not
get out of the buffer.
Signed-off-by: Dafna Hirschfeld <dafna3@gmail.com>
---
Changes from v1:
set OVERFLOW_BIT in derlc return val to indicate overflow.
fix return value type from s16 to u16
drivers/media/platform/vicodec/codec-fwht.c | 71 +++++++++++++------
drivers/media/platform/vicodec/codec-fwht.h | 2 +-
.../media/platform/vicodec/codec-v4l2-fwht.c | 8 ++-
drivers/media/platform/vicodec/vicodec-core.c | 4 ++
4 files changed, 60 insertions(+), 25 deletions(-)
diff --git a/drivers/media/platform/vicodec/codec-fwht.c b/drivers/media/platform/vicodec/codec-fwht.c
index e5e0a80c2f73..d1d6085da9f1 100644
--- a/drivers/media/platform/vicodec/codec-fwht.c
+++ b/drivers/media/platform/vicodec/codec-fwht.c
@@ -13,6 +13,8 @@
#include <linux/kernel.h>
#include "codec-fwht.h"
+#define OVERFLOW_BIT BIT(14)
+
/*
* Note: bit 0 of the header must always be 0. Otherwise it cannot
* be guaranteed that the magic 8 byte sequence (see below) can
@@ -104,16 +106,21 @@ static int rlc(const s16 *in, __be16 *output, int blocktype)
* This function will worst-case increase rlc_in by 65*2 bytes:
* one s16 value for the header and 8 * 8 coefficients of type s16.
*/
-static s16 derlc(const __be16 **rlc_in, s16 *dwht_out)
+static u16 derlc(const __be16 **rlc_in, s16 *dwht_out,
+ const __be16 *end_of_input)
{
/* header */
const __be16 *input = *rlc_in;
- s16 ret = ntohs(*input++);
+ u16 stat;
int dec_count = 0;
s16 block[8 * 8 + 16];
s16 *wp = block;
int i;
+ if (input > end_of_input)
+ return OVERFLOW_BIT;
+ stat = ntohs(*input++);
+
/*
* Now de-compress, it expands one byte to up to 15 bytes
* (or fills the remainder of the 64 bytes with zeroes if it
@@ -123,9 +130,15 @@ static s16 derlc(const __be16 **rlc_in, s16 *dwht_out)
* allow for overflow if the incoming data was malformed.
*/
while (dec_count < 8 * 8) {
- s16 in = ntohs(*input++);
- int length = in & 0xf;
- int coeff = in >> 4;
+ s16 in;
+ int length;
+ int coeff;
+
+ if (input > end_of_input)
+ return OVERFLOW_BIT;
+ in = ntohs(*input++);
+ length = in & 0xf;
+ coeff = in >> 4;
/* fill remainder with zeros */
if (length == 15) {
@@ -150,7 +163,7 @@ static s16 derlc(const __be16 **rlc_in, s16 *dwht_out)
dwht_out[x + y * 8] = *wp++;
}
*rlc_in = input;
- return ret;
+ return stat;
}
static const int quant_table[] = {
@@ -808,22 +821,24 @@ u32 fwht_encode_frame(struct fwht_raw_frame *frm,
return encoding;
}
-static void decode_plane(struct fwht_cframe *cf, const __be16 **rlco, u8 *ref,
+static bool decode_plane(struct fwht_cframe *cf, const __be16 **rlco, u8 *ref,
u32 height, u32 width, u32 coded_width,
- bool uncompressed)
+ bool uncompressed, const __be16 *end_of_rlco_buf)
{
unsigned int copies = 0;
s16 copy[8 * 8];
- s16 stat;
+ u16 stat;
unsigned int i, j;
width = round_up(width, 8);
height = round_up(height, 8);
if (uncompressed) {
+ if (end_of_rlco_buf + 1 < *rlco + width * height / 2)
+ return false;
memcpy(ref, *rlco, width * height);
*rlco += width * height / 2;
- return;
+ return true;
}
/*
@@ -847,8 +862,9 @@ static void decode_plane(struct fwht_cframe *cf, const __be16 **rlco, u8 *ref,
continue;
}
- stat = derlc(rlco, cf->coeffs);
-
+ stat = derlc(rlco, cf->coeffs, end_of_rlco_buf);
+ if (stat & OVERFLOW_BIT)
+ return false;
if (stat & PFRAME_BIT)
dequantize_inter(cf->coeffs);
else
@@ -865,17 +881,22 @@ static void decode_plane(struct fwht_cframe *cf, const __be16 **rlco, u8 *ref,
fill_decoder_block(refp, cf->de_fwht, coded_width);
}
}
+ return true;
}
-void fwht_decode_frame(struct fwht_cframe *cf, struct fwht_raw_frame *ref,
+bool fwht_decode_frame(struct fwht_cframe *cf, struct fwht_raw_frame *ref,
u32 hdr_flags, unsigned int components_num,
unsigned int width, unsigned int height,
unsigned int coded_width)
{
const __be16 *rlco = cf->rlc_data;
+ const __be16 *end_of_rlco_buf = cf->rlc_data +
+ (cf->size / sizeof(*rlco)) - 1;
- decode_plane(cf, &rlco, ref->luma, height, width, coded_width,
- hdr_flags & FWHT_FL_LUMA_IS_UNCOMPRESSED);
+ if (!decode_plane(cf, &rlco, ref->luma, height, width, coded_width,
+ hdr_flags & FWHT_FL_LUMA_IS_UNCOMPRESSED,
+ end_of_rlco_buf))
+ return false;
if (components_num >= 3) {
u32 h = height;
@@ -888,13 +909,21 @@ void fwht_decode_frame(struct fwht_cframe *cf, struct fwht_raw_frame *ref,
w /= 2;
c /= 2;
}
- decode_plane(cf, &rlco, ref->cb, h, w, c,
- hdr_flags & FWHT_FL_CB_IS_UNCOMPRESSED);
- decode_plane(cf, &rlco, ref->cr, h, w, c,
- hdr_flags & FWHT_FL_CR_IS_UNCOMPRESSED);
+ if (!decode_plane(cf, &rlco, ref->cb, h, w, c,
+ hdr_flags & FWHT_FL_CB_IS_UNCOMPRESSED,
+ end_of_rlco_buf))
+ return false;
+ if (!decode_plane(cf, &rlco, ref->cr, h, w, c,
+ hdr_flags & FWHT_FL_CR_IS_UNCOMPRESSED,
+ end_of_rlco_buf))
+ return false;
}
if (components_num == 4)
- decode_plane(cf, &rlco, ref->alpha, height, width, coded_width,
- hdr_flags & FWHT_FL_ALPHA_IS_UNCOMPRESSED);
+ if (!decode_plane(cf, &rlco, ref->alpha, height, width,
+ coded_width,
+ hdr_flags & FWHT_FL_ALPHA_IS_UNCOMPRESSED,
+ end_of_rlco_buf))
+ return false;
+ return true;
}
diff --git a/drivers/media/platform/vicodec/codec-fwht.h b/drivers/media/platform/vicodec/codec-fwht.h
index ad8cfc60a152..60d71d9dacb3 100644
--- a/drivers/media/platform/vicodec/codec-fwht.h
+++ b/drivers/media/platform/vicodec/codec-fwht.h
@@ -139,7 +139,7 @@ u32 fwht_encode_frame(struct fwht_raw_frame *frm,
bool is_intra, bool next_is_intra,
unsigned int width, unsigned int height,
unsigned int stride, unsigned int chroma_stride);
-void fwht_decode_frame(struct fwht_cframe *cf, struct fwht_raw_frame *ref,
+bool fwht_decode_frame(struct fwht_cframe *cf, struct fwht_raw_frame *ref,
u32 hdr_flags, unsigned int components_num,
unsigned int width, unsigned int height,
unsigned int coded_width);
diff --git a/drivers/media/platform/vicodec/codec-v4l2-fwht.c b/drivers/media/platform/vicodec/codec-v4l2-fwht.c
index ee6903b8896c..c15034849133 100644
--- a/drivers/media/platform/vicodec/codec-v4l2-fwht.c
+++ b/drivers/media/platform/vicodec/codec-v4l2-fwht.c
@@ -280,6 +280,7 @@ int v4l2_fwht_decode(struct v4l2_fwht_state *state, u8 *p_in, u8 *p_out)
state->ycbcr_enc = ntohl(state->header.ycbcr_enc);
state->quantization = ntohl(state->header.quantization);
cf.rlc_data = (__be16 *)p_in;
+ cf.size = ntohl(state->header.size);
hdr_width_div = (flags & FWHT_FL_CHROMA_FULL_WIDTH) ? 1 : 2;
hdr_height_div = (flags & FWHT_FL_CHROMA_FULL_HEIGHT) ? 1 : 2;
@@ -287,9 +288,10 @@ int v4l2_fwht_decode(struct v4l2_fwht_state *state, u8 *p_in, u8 *p_out)
hdr_height_div != info->height_div)
return -EINVAL;
- fwht_decode_frame(&cf, &state->ref_frame, flags, components_num,
- state->visible_width, state->visible_height,
- state->coded_width);
+ if (!fwht_decode_frame(&cf, &state->ref_frame, flags, components_num,
+ state->visible_width, state->visible_height,
+ state->coded_width))
+ return -EINVAL;
/*
* TODO - handle the case where the compressed stream encodes a
diff --git a/drivers/media/platform/vicodec/vicodec-core.c b/drivers/media/platform/vicodec/vicodec-core.c
index b84dae343645..953b9c4816a5 100644
--- a/drivers/media/platform/vicodec/vicodec-core.c
+++ b/drivers/media/platform/vicodec/vicodec-core.c
@@ -186,6 +186,10 @@ static int device_process(struct vicodec_ctx *ctx,
return ret;
vb2_set_plane_payload(&dst_vb->vb2_buf, 0, ret);
} else {
+ unsigned int comp_frame_size = ntohl(ctx->state.header.size);
+
+ if (comp_frame_size > ctx->comp_max_size)
+ return -EINVAL;
state->info = q_dst->info;
ret = v4l2_fwht_decode(state, p_src, p_dst);
if (ret < 0)
--
2.17.1
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