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tiff2bw: avoid null pointer dereference in case of out of memory situation. Fixes http://bugzilla.maptools.org/show_bug.cgi?id=2819 / CVE-2018-18661

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This commit is contained in:
Even Rouault 2018-10-30 18:50:27 +01:00
parent 67b755b334
commit 99b10edde9
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GPG Key ID: 33EBBFC47B3DD87D
1 changed files with 26 additions and 1 deletions
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27
tools/tiff2bw.c
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@ -38,6 +38,7 @@
#endif
#include "tiffio.h"
#include "tiffiop.h"
#define streq(a,b) (strcmp((a),(b)) == 0)
#define strneq(a,b,n) (strncmp(a,b,n) == 0)
@ -221,6 +222,11 @@ main(int argc, char* argv[])
TIFFSetField(out, TIFFTAG_IMAGEDESCRIPTION, thing);
TIFFSetField(out, TIFFTAG_SOFTWARE, "tiff2bw");
outbuf = (unsigned char *)_TIFFmalloc(TIFFScanlineSize(out));
if( !outbuf )
{
fprintf(stderr, "Out of memory\n");
goto tiff2bw_error;
}
TIFFSetField(out, TIFFTAG_ROWSPERSTRIP,
TIFFDefaultStripSize(out, rowsperstrip));
@ -244,6 +250,11 @@ main(int argc, char* argv[])
#undef CVT
}
inbuf = (unsigned char *)_TIFFmalloc(TIFFScanlineSize(in));
if( !inbuf )
{
fprintf(stderr, "Out of memory\n");
goto tiff2bw_error;
}
for (row = 0; row < h; row++) {
if (TIFFReadScanline(in, inbuf, row, 0) < 0)
break;
@ -254,6 +265,11 @@ main(int argc, char* argv[])
break;
case pack(PHOTOMETRIC_RGB, PLANARCONFIG_CONTIG):
inbuf = (unsigned char *)_TIFFmalloc(TIFFScanlineSize(in));
if( !inbuf )
{
fprintf(stderr, "Out of memory\n");
goto tiff2bw_error;
}
for (row = 0; row < h; row++) {
if (TIFFReadScanline(in, inbuf, row, 0) < 0)
break;
@ -263,8 +279,16 @@ main(int argc, char* argv[])
}
break;
case pack(PHOTOMETRIC_RGB, PLANARCONFIG_SEPARATE):
{
tmsize_t inbufsize;
rowsize = TIFFScanlineSize(in);
inbuf = (unsigned char *)_TIFFmalloc(3*rowsize);
inbufsize = TIFFSafeMultiply(tmsize_t, 3, rowsize);
inbuf = (unsigned char *)_TIFFmalloc(inbufsize);
if( !inbuf )
{
fprintf(stderr, "Out of memory\n");
goto tiff2bw_error;
}
for (row = 0; row < h; row++) {
for (s = 0; s < 3; s++)
if (TIFFReadScanline(in,
@ -277,6 +301,7 @@ main(int argc, char* argv[])
}
break;
}
}
#undef pack
if (inbuf)
_TIFFfree(inbuf);