diff options
Diffstat (limited to 'meta/recipes-extended/ghostscript/ghostscript/CVE-2021-45949.patch')
| -rw-r--r-- | meta/recipes-extended/ghostscript/ghostscript/CVE-2021-45949.patch | 65 |
1 files changed, 65 insertions, 0 deletions
diff --git a/meta/recipes-extended/ghostscript/ghostscript/CVE-2021-45949.patch b/meta/recipes-extended/ghostscript/ghostscript/CVE-2021-45949.patch new file mode 100644 index 0000000000..f312f89e04 --- /dev/null +++ b/meta/recipes-extended/ghostscript/ghostscript/CVE-2021-45949.patch @@ -0,0 +1,65 @@ +From 6643ff0cb837db3eade489ffff21e3e92eee2ae0 Mon Sep 17 00:00:00 2001 +From: Chris Liddell <chris.liddell@artifex.com> +Date: Fri, 28 Jan 2022 08:21:19 +0000 +Subject: [PATCH] [PATCH] Bug 703902: Fix op stack management in + sampled_data_continue() + +Replace pop() (which does no checking, and doesn't handle stack extension +blocks) with ref_stack_pop() which does do all that. + +We still use pop() in one case (it's faster), but we have to later use +ref_stack_pop() before calling sampled_data_sample() which also accesses the +op stack. + +Fixes: +https://bugs.chromium.org/p/oss-fuzz/issues/detail?id=34675 + +Upstream-Status: Backported [https://git.ghostscript.com/?p=ghostpdl.git;a=commit;h=2a3129365d3bc0d4a41f107ef175920d1505d1f7] +CVE: CVE-2021-45949 +Signed-off-by: Minjae Kim <flowergom@gmail.com> +--- + psi/zfsample.c | 13 ++++++++----- + 1 file changed, 8 insertions(+), 5 deletions(-) + +diff --git a/psi/zfsample.c b/psi/zfsample.c +index 0023fa4..f84671f 100644 +--- a/psi/zfsample.c ++++ b/psi/zfsample.c +@@ -534,14 +534,17 @@ sampled_data_continue(i_ctx_t *i_ctx_p) + data_ptr[bps * i + j] = (byte)(cv >> ((bps - 1 - j) * 8)); /* MSB first */ + } + pop(num_out); /* Move op to base of result values */ +- ++ /* From here on, we have to use ref_stack_pop() rather than pop() ++ so that it handles stack extension blocks properly, before calling ++ sampled_data_sample() which also uses the op stack. ++ */ + /* Check if we are done collecting data. */ + + if (increment_cube_indexes(params, penum->indexes)) { + if (stack_depth_adjust == 0) +- pop(O_STACK_PAD); /* Remove spare stack space */ ++ ref_stack_pop(&o_stack, O_STACK_PAD); /* Remove spare stack space */ + else +- pop(stack_depth_adjust - num_out); ++ ref_stack_pop(&o_stack, stack_depth_adjust - num_out); + /* Execute the closing procedure, if given */ + code = 0; + if (esp_finish_proc != 0) +@@ -554,11 +557,11 @@ sampled_data_continue(i_ctx_t *i_ctx_p) + if ((O_STACK_PAD - stack_depth_adjust) < 0) { + stack_depth_adjust = -(O_STACK_PAD - stack_depth_adjust); + check_op(stack_depth_adjust); +- pop(stack_depth_adjust); ++ ref_stack_pop(&o_stack, stack_depth_adjust); + } + else { + check_ostack(O_STACK_PAD - stack_depth_adjust); +- push(O_STACK_PAD - stack_depth_adjust); ++ ref_stack_push(&o_stack, O_STACK_PAD - stack_depth_adjust); + for (i=0;i<O_STACK_PAD - stack_depth_adjust;i++) + make_null(op - i); + } +-- +2.17.1 + |