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From d77d726d206f16232df6edd80739720bb7011aea Mon Sep 17 00:00:00 2001
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From: Pali <pali@cpan.org>
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Date: Thu, 7 Oct 2021 22:35:51 +0200
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Subject: [PATCH] Fix memory leak in function encode_method()
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Pull request https://github.com/dankogai/p5-encode/pull/72 fixed memory
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corruption but introduced a new memory leak as dst scalar is not mortal
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anymore and not every possible exit from every XS function properly release
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scalar's memory.
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Fix this memory leak by making dst scalar mortal again. To not re-introduce
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that memory corruption, first store dst scalar into temporary variable and
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then save it into stack via ST(0) macro.
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---
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Encode.xs | 23 ++++++++++++-----------
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1 file changed, 12 insertions(+), 11 deletions(-)
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diff --git a/Encode.xs b/Encode.xs
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index 4baf296..d173c96 100644
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--- a/Encode.xs
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+++ b/Encode.xs
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@@ -154,7 +154,7 @@ encode_method(pTHX_ const encode_t * enc, const encpage_t * dir, SV * src, U8 *
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STRLEN sdone = 0;
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/* We allocate slen+1.
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PerlIO dumps core if this value is smaller than this. */
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- SV *dst = newSV(slen+1);
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+ SV *dst = sv_2mortal(newSV(slen+1));
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U8 *d = (U8 *)SvPVX(dst);
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STRLEN dlen = SvLEN(dst)-1;
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int code = 0;
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@@ -810,13 +810,12 @@ CODE:
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tmp = encode_method(aTHX_ enc, enc->t_utf8, src, s, slen, check,
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&offset, term, &code, fallback_cb);
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sv_catsv(dst, tmp);
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- SvREFCNT_dec(tmp);
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SvIV_set(off, (IV)offset);
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RETVAL = (code == ENCODE_FOUND_TERM);
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OUTPUT:
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RETVAL
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-SV *
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+void
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Method_decode(obj,src,check_sv = &PL_sv_no)
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SV * obj
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SV * src
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@@ -828,6 +827,7 @@ PREINIT:
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encode_t *enc;
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U8 *s;
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STRLEN slen;
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+ SV *ret;
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INIT:
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SvGETMAGIC(src);
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SvGETMAGIC(check_sv);
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@@ -841,13 +841,13 @@ CODE:
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s = modify ? (U8 *)SvPV_force_nomg(src, slen) : (U8 *)SvPV_nomg(src, slen);
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if (SvUTF8(src))
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utf8_safe_downgrade(aTHX_ &src, &s, &slen, modify);
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- RETVAL = encode_method(aTHX_ enc, enc->t_utf8, src, s, slen, check,
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+ ret = encode_method(aTHX_ enc, enc->t_utf8, src, s, slen, check,
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NULL, Nullsv, NULL, fallback_cb);
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- SvUTF8_on(RETVAL);
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-OUTPUT:
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- RETVAL
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+ SvUTF8_on(ret);
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+ ST(0) = ret;
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+ XSRETURN(1);
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-SV *
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+void
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Method_encode(obj,src,check_sv = &PL_sv_no)
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SV * obj
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SV * src
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@@ -859,6 +859,7 @@ PREINIT:
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encode_t *enc;
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U8 *s;
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STRLEN slen;
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+ SV *ret;
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INIT:
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SvGETMAGIC(src);
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SvGETMAGIC(check_sv);
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@@ -872,10 +873,10 @@ CODE:
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s = modify ? (U8 *)SvPV_force_nomg(src, slen) : (U8 *)SvPV_nomg(src, slen);
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if (!SvUTF8(src))
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utf8_safe_upgrade(aTHX_ &src, &s, &slen, modify);
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- RETVAL = encode_method(aTHX_ enc, enc->f_utf8, src, s, slen, check,
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+ ret = encode_method(aTHX_ enc, enc->f_utf8, src, s, slen, check,
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NULL, Nullsv, NULL, fallback_cb);
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-OUTPUT:
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- RETVAL
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+ ST(0) = ret;
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+ XSRETURN(1);
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bool
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Method_needs_lines(obj)
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--
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2.31.1
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