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author | markj <markj@FreeBSD.org> | 2014-08-04 18:52:26 +0000 |
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committer | markj <markj@FreeBSD.org> | 2014-08-04 18:52:26 +0000 |
commit | 99b1d997d7c2bea95649a6e3f27953035684bd24 (patch) | |
tree | 1927aeb2bf090ca7ed36d4900372e7e9f32ade2a /cddl | |
parent | 83f0bdc908f57f74685e6e770d45c6bc67070d78 (diff) | |
download | FreeBSD-src-99b1d997d7c2bea95649a6e3f27953035684bd24.zip FreeBSD-src-99b1d997d7c2bea95649a6e3f27953035684bd24.tar.gz |
Preserve the errno value of an ioctl before calling free(3). Previously,
errno was very occasionally being clobbered, resulting in a bogus error from
dt_consume() and thus an error from dtrace(1).
MFC after: 2 weeks
Diffstat (limited to 'cddl')
3 files changed, 14 insertions, 11 deletions
diff --git a/cddl/contrib/opensolaris/lib/libdtrace/common/dt_consume.c b/cddl/contrib/opensolaris/lib/libdtrace/common/dt_consume.c index ae1ed00..072cb05 100644 --- a/cddl/contrib/opensolaris/lib/libdtrace/common/dt_consume.c +++ b/cddl/contrib/opensolaris/lib/libdtrace/common/dt_consume.c @@ -2944,7 +2944,7 @@ dt_get_buf(dtrace_hdl_t *dtp, int cpu, dtrace_bufdesc_t **bufp) { dtrace_optval_t size; dtrace_bufdesc_t *buf = dt_zalloc(dtp, sizeof (*buf)); - int error; + int error, rval; if (buf == NULL) return (-1); @@ -2963,7 +2963,6 @@ dt_get_buf(dtrace_hdl_t *dtp, int cpu, dtrace_bufdesc_t **bufp) #else if (dt_ioctl(dtp, DTRACEIOC_BUFSNAP, &buf) == -1) { #endif - dt_put_buf(dtp, buf); /* * If we failed with ENOENT, it may be because the * CPU was unconfigured -- this is okay. Any other @@ -2971,10 +2970,12 @@ dt_get_buf(dtrace_hdl_t *dtp, int cpu, dtrace_bufdesc_t **bufp) */ if (errno == ENOENT) { *bufp = NULL; - return (0); - } + rval = 0; + } else + rval = dt_set_errno(dtp, errno); - return (dt_set_errno(dtp, errno)); + dt_put_buf(dtp, buf); + return (rval); } error = dt_unring_buf(dtp, buf); diff --git a/cddl/contrib/opensolaris/lib/libdtrace/common/dt_map.c b/cddl/contrib/opensolaris/lib/libdtrace/common/dt_map.c index c6d92c8..6ab7cd9 100644 --- a/cddl/contrib/opensolaris/lib/libdtrace/common/dt_map.c +++ b/cddl/contrib/opensolaris/lib/libdtrace/common/dt_map.c @@ -39,7 +39,7 @@ static int dt_strdata_add(dtrace_hdl_t *dtp, dtrace_recdesc_t *rec, void ***data, int *max) { - int maxformat; + int maxformat, rval; dtrace_fmtdesc_t fmt; void *result; @@ -63,8 +63,9 @@ dt_strdata_add(dtrace_hdl_t *dtp, dtrace_recdesc_t *rec, void ***data, int *max) return (dt_set_errno(dtp, EDT_NOMEM)); if (dt_ioctl(dtp, DTRACEIOC_FORMAT, &fmt) == -1) { + rval = dt_set_errno(dtp, errno); free(fmt.dtfd_string); - return (dt_set_errno(dtp, errno)); + return (rval); } while (rec->dtrd_format > (maxformat = *max)) { diff --git a/cddl/contrib/opensolaris/lib/libdtrace/common/dt_work.c b/cddl/contrib/opensolaris/lib/libdtrace/common/dt_work.c index 68e64bb..d19fb88 100644 --- a/cddl/contrib/opensolaris/lib/libdtrace/common/dt_work.c +++ b/cddl/contrib/opensolaris/lib/libdtrace/common/dt_work.c @@ -184,7 +184,7 @@ dtrace_go(dtrace_hdl_t *dtp) { dtrace_enable_io_t args; void *dof; - int err; + int error, r; if (dtp->dt_active) return (dt_set_errno(dtp, EINVAL)); @@ -206,11 +206,12 @@ dtrace_go(dtrace_hdl_t *dtp) args.dof = dof; args.n_matched = 0; - err = dt_ioctl(dtp, DTRACEIOC_ENABLE, &args); + r = dt_ioctl(dtp, DTRACEIOC_ENABLE, &args); + error = errno; dtrace_dof_destroy(dtp, dof); - if (err == -1 && (errno != ENOTTY || dtp->dt_vector == NULL)) - return (dt_set_errno(dtp, errno)); + if (r == -1 && (error != ENOTTY || dtp->dt_vector == NULL)) + return (dt_set_errno(dtp, error)); if (dt_ioctl(dtp, DTRACEIOC_GO, &dtp->dt_beganon) == -1) { if (errno == EACCES) |