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dtrace: avoid gcc9 Walloca-larger-than

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gcc9 grew a new warning for unbounded allocas, such as the one in
dt_options_load.  Remove both uses of alloca in dt_options.c.

Reviewed by:	markj
Sponsored by:	Dell EMC Isilon
Differential Revision:	https://reviews.freebsd.org/D22880
This commit is contained in:
Ryan Libby 2019-12-21 02:44:13 +00:00
parent 36947e1f4d
commit fa19b250bd
Notes: svn2git 2020-12-20 02:59:44 +00:00 
svn path=/head/; revision=355973
1 changed files with 47 additions and 21 deletions
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68
cddl/contrib/opensolaris/lib/libdtrace/common/dt_options.c
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@ -38,9 +38,6 @@
#include <stdlib.h>
#include <unistd.h>
#include <limits.h>
#ifdef illumos
#include <alloca.h>
#endif
#include <errno.h>
#include <fcntl.h>
@ -162,26 +159,40 @@ dt_opt_cpp_path(dtrace_hdl_t *dtp, const char *arg, uintptr_t option)
static int
dt_opt_cpp_opts(dtrace_hdl_t *dtp, const char *arg, uintptr_t option)
{
char *buf;
char *buf = NULL;
size_t len;
const char *opt = (const char *)option;
int ret;
if (opt == NULL || arg == NULL)
return (dt_set_errno(dtp, EDT_BADOPTVAL));
if (opt == NULL || arg == NULL) {
ret = dt_set_errno(dtp, EDT_BADOPTVAL);
goto out;
}
if (dtp->dt_pcb != NULL)
return (dt_set_errno(dtp, EDT_BADOPTCTX));
if (dtp->dt_pcb != NULL) {
ret = dt_set_errno(dtp, EDT_BADOPTCTX);
goto out;
}
len = strlen(opt) + strlen(arg) + 1;
buf = alloca(len);
if ((buf = dt_alloc(dtp, len)) == NULL) {
ret = dt_set_errno(dtp, EDT_NOMEM);
goto out;
}
(void) strcpy(buf, opt);
(void) strcat(buf, arg);
if (dt_cpp_add_arg(dtp, buf) == NULL)
return (dt_set_errno(dtp, EDT_NOMEM));
if (dt_cpp_add_arg(dtp, buf) == NULL) {
ret = dt_set_errno(dtp, EDT_NOMEM);
goto out;
}
return (0);
ret = 0;
out:
if (buf != NULL)
dt_free(dtp, buf);
return (ret);
}
/*ARGSUSED*/
@ -885,27 +896,35 @@ dt_options_load(dtrace_hdl_t *dtp)
dof_hdr_t hdr, *dof;
dof_sec_t *sec;
size_t offs;
int i;
int i, ret;
/*
* To load the option values, we need to ask the kernel to provide its
* DOF, which we'll sift through to look for OPTDESC sections.
*/
dof = &hdr;
bzero(&hdr, sizeof (dof_hdr_t));
hdr.dofh_loadsz = sizeof (dof_hdr_t);
#ifdef illumos
if (dt_ioctl(dtp, DTRACEIOC_DOFGET, &hdr) == -1)
if (dt_ioctl(dtp, DTRACEIOC_DOFGET, dof) == -1)
#else
dof = &hdr;
if (dt_ioctl(dtp, DTRACEIOC_DOFGET, &dof) == -1)
#endif
return (dt_set_errno(dtp, errno));
{
ret = dt_set_errno(dtp, errno);
goto out;
}
if (hdr.dofh_loadsz < sizeof (dof_hdr_t))
return (dt_set_errno(dtp, EINVAL));
if (hdr.dofh_loadsz < sizeof (dof_hdr_t)) {
ret = dt_set_errno(dtp, EINVAL);
goto out;
}
dof = alloca(hdr.dofh_loadsz);
if ((dof = dt_alloc(dtp, hdr.dofh_loadsz)) == NULL) {
ret = dt_set_errno(dtp, EDT_NOMEM);
goto out;
}
bzero(dof, sizeof (dof_hdr_t));
dof->dofh_loadsz = hdr.dofh_loadsz;
@ -917,7 +936,10 @@ dt_options_load(dtrace_hdl_t *dtp)
#else
if (dt_ioctl(dtp, DTRACEIOC_DOFGET, &dof) == -1)
#endif
return (dt_set_errno(dtp, errno));
{
ret = dt_set_errno(dtp, errno);
goto out;
}
for (i = 0; i < dof->dofh_secnum; i++) {
sec = (dof_sec_t *)(uintptr_t)((uintptr_t)dof +
@ -942,7 +964,11 @@ dt_options_load(dtrace_hdl_t *dtp)
dtp->dt_options[opt->dofo_option] = opt->dofo_value;
}
return (0);
ret = 0;
out:
if (dof != NULL && dof != &hdr)
dt_free(dtp, dof);
return (ret);
}
typedef struct dt_option {