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* libtiff/tif_lzw.c: make nextdata a unsigned type to avoid

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undefined behaviour with shifts (gcc -fsanitize=shift)
This commit is contained in:
Even Rouault 2015-08-30 21:07:44 +00:00
parent 6dc8110cee
commit 42bfc7006a
2 changed files with 11 additions and 5 deletions
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4
ChangeLog
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@ -1,5 +1,9 @@
2015-08-30 Even Rouault <even.rouault at spatialys.com>
* libtiff/tif_lzw.c: make nextdata a unsigned type to avoid
undefined behaviour with shifts (gcc -fsanitize=shift)
2015-08-30 Even Rouault <even.rouault at spatialys.com>
* libtiff/tif_fax3.c, libtiff/tif_lzw.c, libtiff/tif_predict.c:
add explicit masking with 0xff before casting
to unsigned char (make icc -check=conversions happy)

12
libtiff/tif_lzw.c
View File

@ -1,4 +1,4 @@
/* $Id: tif_lzw.c,v 1.48 2015-08-30 20:49:55 erouault Exp $ */
/* $Id: tif_lzw.c,v 1.49 2015-08-30 21:07:44 erouault Exp $ */
/*
* Copyright (c) 1988-1997 Sam Leffler
@ -94,7 +94,7 @@ typedef struct {
unsigned short nbits; /* # of bits/code */
unsigned short maxcode; /* maximum code for lzw_nbits */
unsigned short free_ent; /* next free entry in hash table */
long nextdata; /* next bits of i/o */
unsigned long nextdata; /* next bits of i/o */
long nextbits; /* # of valid bits in lzw_nextdata */
int rw_mode; /* preserve rw_mode from init */
@ -367,7 +367,8 @@ LZWDecode(TIFF* tif, uint8* op0, tmsize_t occ0, uint16 s)
unsigned char *bp;
hcode_t code;
int len;
long nbits, nextbits, nextdata, nbitsmask;
long nbits, nextbits, nbitsmask;
unsigned long nextdata;
code_t *codep, *free_entp, *maxcodep, *oldcodep;
(void) s;
@ -874,7 +875,8 @@ LZWEncode(TIFF* tif, uint8* bp, tmsize_t cc, uint16 s)
hcode_t ent;
long disp;
long incount, outcount, checkpoint;
long nextdata, nextbits;
unsigned long nextdata;
long nextbits;
int free_ent, maxcode, nbits;
uint8* op;
uint8* limit;
@ -1036,7 +1038,7 @@ LZWPostEncode(TIFF* tif)
register LZWCodecState *sp = EncoderState(tif);
uint8* op = tif->tif_rawcp;
long nextbits = sp->lzw_nextbits;
long nextdata = sp->lzw_nextdata;
unsigned long nextdata = sp->lzw_nextdata;
long outcount = sp->enc_outcount;
int nbits = sp->lzw_nbits;