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avcodec/pcx: Check for end of input in pcx_rle_decode() and propagate error

Browse Source 
Fixes: Timeout
Fixes: 10279/clusterfuzz-testcase-minimized-ffmpeg_AV_CODEC_ID_PCX_fuzzer-5729311395414016

Found-by: continuous fuzzing process https://github.com/google/oss-fuzz/tree/master/projects/ffmpeg
Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>
This commit is contained in:
Michael Niedermayer 2018-09-15 22:57:59 +02:00
parent 86e76762fc
commit 7ed8d5cfd9
1 changed files with 17 additions and 5 deletions
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22
libavcodec/pcx.c
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@ -30,7 +30,7 @@
#define PCX_HEADER_SIZE 128
static void pcx_rle_decode(GetByteContext *gb,
static int pcx_rle_decode(GetByteContext *gb,
uint8_t *dst,
unsigned int bytes_per_scanline,
int compressed)
@ -38,6 +38,9 @@ static void pcx_rle_decode(GetByteContext *gb,
unsigned int i = 0;
unsigned char run, value;
if (bytestream2_get_bytes_left(gb) < 1)
return AVERROR_INVALIDDATA;
if (compressed) {
while (i < bytes_per_scanline && bytestream2_get_bytes_left(gb)>0) {
run = 1;
@ -52,6 +55,7 @@ static void pcx_rle_decode(GetByteContext *gb,
} else {
bytestream2_get_buffer(gb, dst, bytes_per_scanline);
}
return 0;
}
static void pcx_palette(GetByteContext *gb, uint32_t *dst, int pallen)
@ -153,7 +157,9 @@ static int pcx_decode_frame(AVCodecContext *avctx, void *data, int *got_frame,
if (nplanes == 3 && bits_per_pixel == 8) {
for (y = 0; y < h; y++) {
pcx_rle_decode(&gb, scanline, bytes_per_scanline, compressed);
ret = pcx_rle_decode(&gb, scanline, bytes_per_scanline, compressed);
if (ret < 0)
goto end;
for (x = 0; x < w; x++) {
ptr[3 * x] = scanline[x];
@ -174,7 +180,9 @@ static int pcx_decode_frame(AVCodecContext *avctx, void *data, int *got_frame,
}
for (y = 0; y < h; y++, ptr += stride) {
pcx_rle_decode(&gb, scanline, bytes_per_scanline, compressed);
ret = pcx_rle_decode(&gb, scanline, bytes_per_scanline, compressed);
if (ret < 0)
goto end;
memcpy(ptr, scanline, w);
}
@ -194,7 +202,9 @@ static int pcx_decode_frame(AVCodecContext *avctx, void *data, int *got_frame,
for (y = 0; y < h; y++) {
init_get_bits8(&s, scanline, bytes_per_scanline);
pcx_rle_decode(&gb, scanline, bytes_per_scanline, compressed);
ret = pcx_rle_decode(&gb, scanline, bytes_per_scanline, compressed);
if (ret < 0)
goto end;
for (x = 0; x < w; x++)
ptr[x] = get_bits(&s, bits_per_pixel);
@ -204,7 +214,9 @@ static int pcx_decode_frame(AVCodecContext *avctx, void *data, int *got_frame,
int i;
for (y = 0; y < h; y++) {
pcx_rle_decode(&gb, scanline, bytes_per_scanline, compressed);
ret = pcx_rle_decode(&gb, scanline, bytes_per_scanline, compressed);
if (ret < 0)
goto end;
for (x = 0; x < w; x++) {
int m = 0x80 >> (x & 7), v = 0;