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Attempt to fix Coverity issues in ssp

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* ssp.c (lookup_thread_id): Consistently check if tix is a null
	pointer.
	(run_program): Annotate that STATUS_BREAKPOINT falls-through to
	STATUS_SINGLE_STEP case.
	(main): Guard against high_pc-low_pc overflow and malloc failure.

Signed-off-by: Jon Turney <jon.turney@dronecode.org.uk>
This commit is contained in:
Jon Turney 2016-03-15 12:57:33 +00:00
parent 7176a85cd4
commit e8e379ff1d
1 changed files with 17 additions and 6 deletions
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23
winsup/utils/ssp.c
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@ -182,7 +182,10 @@ static HANDLE
lookup_thread_id (DWORD threadId, int *tix)
{
int i;
*tix = 0;
if (tix)
*tix = 0;
for (i=0; i<num_active_threads; i++)
if (active_thread_ids[i] == threadId)
{
@ -463,6 +466,7 @@ run_program (char *cmdline)
thread_return_address[tix] = rv;
}
set_step_threads (event.dwThreadId, stepping_enabled);
/* fall-through */
case STATUS_SINGLE_STEP:
opcode_count++;
pc = (CONTEXT_REG)event.u.Exception.ExceptionRecord.ExceptionAddress;
@ -854,6 +858,7 @@ main (int argc, char **argv)
int c, i;
int total_pcount = 0, total_scount = 0;
FILE *gmon;
ssize_t range;
setbuf (stdout, 0);
@ -906,14 +911,20 @@ main (int argc, char **argv)
sscanf (argv[optind++], ADDR_SSCANF_FMT, &low_pc);
sscanf (argv[optind++], ADDR_SSCANF_FMT, &high_pc);
if (low_pc > high_pc-8)
range = high_pc - low_pc;
if (range <= 0)
{
fprintf (stderr, "Hey, low_pc must be lower than high_pc\n");
exit (1);
}
hits = (HISTCOUNTER *)malloc (high_pc-low_pc+4);
memset (hits, 0, high_pc-low_pc+4);
hits = (HISTCOUNTER *)malloc (range+4);
if (!hits)
{
fprintf (stderr, "Ouch, malloc failed\n");
exit (1);
}
memset (hits, 0, range+4);
fprintf (stderr, "prun: [" CONTEXT_REG_FMT "," CONTEXT_REG_FMT "] Running '%s'\n",
low_pc, high_pc, argv[optind]);
@ -922,13 +933,13 @@ main (int argc, char **argv)
hdr.lpc = low_pc;
hdr.hpc = high_pc;
hdr.ncnt = high_pc-low_pc + sizeof (hdr);
hdr.ncnt = range + sizeof (hdr);
hdr.version = GMONVERSION;
hdr.profrate = 100;
gmon = fopen ("gmon.out", "wb");
fwrite (&hdr, 1, sizeof (hdr), gmon);
fwrite (hits, 1, high_pc-low_pc, gmon);
fwrite (hits, 1, range, gmon);
write_call_edges (gmon);
fclose (gmon);