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Fix address violation when attempting to display disassembled data.

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PR binutils/21619
	* objdump.c (disassemble_bytes): Check that there is sufficient
	data available before attempting to display it.
This commit is contained in:
Nick Clifton
2017-06-19 15:57:19 +01:00
parent bc21b167eb
commit d16fdddb4e
2 changed files with 21 additions and 12 deletions
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27
binutils/objdump.c
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@ -1982,20 +1982,23 @@ disassemble_bytes (struct disassemble_info * inf,
pb = octets;
for (; j < addr_offset * opb + pb; j += bpc)
{
int k;
/* PR 21619: Check for a buffer ending early. */
if (j + bpc <= stop_offset * opb)
{
int k;
if (bpc > 1 && inf->display_endian == BFD_ENDIAN_LITTLE)
{
for (k = bpc - 1; k >= 0; k--)
printf ("%02x", (unsigned) data[j + k]);
putchar (' ');
}
else
{
for (k = 0; k < bpc; k++)
printf ("%02x", (unsigned) data[j + k]);
putchar (' ');
if (inf->display_endian == BFD_ENDIAN_LITTLE)
{
for (k = bpc - 1; k >= 0; k--)
printf ("%02x", (unsigned) data[j + k]);
}
else
{
for (k = 0; k < bpc; k++)
printf ("%02x", (unsigned) data[j + k]);
}
}
putchar (' ');
}
}
}