Avoid a null pointer dereference. Signed-off-by: Joe Slater <[email protected]> --- .../unzip/unzip/CVE-2021-4217.patch | 65 +++++++++++++++++++ meta/recipes-extended/unzip/unzip_6.0.bb | 1 + 2 files changed, 66 insertions(+) create mode 100644 meta/recipes-extended/unzip/unzip/CVE-2021-4217.patch
diff --git a/meta/recipes-extended/unzip/unzip/CVE-2021-4217.patch b/meta/recipes-extended/unzip/unzip/CVE-2021-4217.patch new file mode 100644 index 0000000000..7262d14df4 --- /dev/null +++ b/meta/recipes-extended/unzip/unzip/CVE-2021-4217.patch @@ -0,0 +1,65 @@ +From 731d698377dbd1f5b1b90efeb8094602ed59fc40 Mon Sep 17 00:00:00 2001 +From: Nils Bars <[email protected]> +Date: Mon, 17 Jan 2022 16:53:16 +0000 +Subject: [PATCH] Fix null pointer dereference and use of uninitialized data + +This fixes a bug that causes use of uninitialized heap data if `readbuf` fails +to read as many bytes as indicated by the extra field length attribute. +Furthermore, this fixes a null pointer dereference if an archive contains an +`EF_UNIPATH` extra field but does not have a filename set. +--- + fileio.c | 5 ++++- + process.c | 6 +++++- + 2 files changed, 9 insertions(+), 2 deletions(-) +--- + +https://launchpadlibrarian.net/580782282/0001-Fix-null-pointer-dereference-and-use-of-uninitialized-data.patch +Regenerated to apply without offsets. + +CVE: CVE-2021-4217 + +Upstream-Status: Inappropriate [not author] + +Signed-off-by: Joe Slater <[email protected]> + + +diff --git a/fileio.c b/fileio.c +index 14460f3..1dc319e 100644 +--- a/fileio.c ++++ b/fileio.c +@@ -2301,8 +2301,11 @@ int do_string(__G__ length, option) /* return PK-type error code */ + seek_zipf(__G__ G.cur_zipfile_bufstart - G.extra_bytes + + (G.inptr-G.inbuf) + length); + } else { +- if (readbuf(__G__ (char *)G.extra_field, length) == 0) ++ unsigned bytes_read = readbuf(__G__ (char *)G.extra_field, length); ++ if (bytes_read == 0) + return PK_EOF; ++ if (bytes_read != length) ++ return PK_ERR; + /* Looks like here is where extra fields are read */ + if (getZip64Data(__G__ G.extra_field, length) != PK_COOL) + { +diff --git a/process.c b/process.c +index 5f8f6c6..de843a5 100644 +--- a/process.c ++++ b/process.c +@@ -2058,10 +2058,14 @@ int getUnicodeData(__G__ ef_buf, ef_len) + G.unipath_checksum = makelong(offset + ef_buf); + offset += 4; + ++ if (!G.filename_full) { ++ /* Check if we have a unicode extra section but no filename set */ ++ return PK_ERR; ++ } ++ + /* + * Compute 32-bit crc + */ +- + chksum = crc32(chksum, (uch *)(G.filename_full), + strlen(G.filename_full)); + +-- +2.32.0 + diff --git a/meta/recipes-extended/unzip/unzip_6.0.bb b/meta/recipes-extended/unzip/unzip_6.0.bb index af94a39195..c222a684b4 100644 --- a/meta/recipes-extended/unzip/unzip_6.0.bb +++ b/meta/recipes-extended/unzip/unzip_6.0.bb @@ -28,6 +28,7 @@ SRC_URI = "${SOURCEFORGE_MIRROR}/infozip/UnZip%206.x%20%28latest%29/UnZip%206.0/ file://CVE-2019-13232_p3.patch \ file://unzip_optimization.patch \ file://0001-configure-Pass-LDFLAGS-to-tests-doing-link-step.patch \ + file://CVE-2021-4217.patch \ " UPSTREAM_VERSION_UNKNOWN = "1" -- 2.35.1
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