This patch adds a fix for a memory leak in grub's path construction in zfs. It is a part of a security series [1].
[1] https://lists.gnu.org/archive/html/grub-devel/2021-03/msg00007.html Signed-off-by: Marta Rybczynska <marta.rybczyn...@huawei.com> --- ...source-leaks-while-constructing-path.patch | 121 ++++++++++++++++++ meta/recipes-bsp/grub/grub2.inc | 1 + 2 files changed, 122 insertions(+) create mode 100644 meta/recipes-bsp/grub/files/0022-zfs-Fix-resource-leaks-while-constructing-path.patch diff --git a/meta/recipes-bsp/grub/files/0022-zfs-Fix-resource-leaks-while-constructing-path.patch b/meta/recipes-bsp/grub/files/0022-zfs-Fix-resource-leaks-while-constructing-path.patch new file mode 100644 index 0000000000..5ded5520e9 --- /dev/null +++ b/meta/recipes-bsp/grub/files/0022-zfs-Fix-resource-leaks-while-constructing-path.patch @@ -0,0 +1,121 @@ +From 83fdffc07ec4586b375ab36189f255ffbd8f99c2 Mon Sep 17 00:00:00 2001 +From: Paulo Flabiano Smorigo <pfsmor...@canonical.com> +Date: Mon, 14 Dec 2020 18:54:49 -0300 +Subject: [PATCH] zfs: Fix resource leaks while constructing path + +There are several exit points in dnode_get_path() that are causing possible +memory leaks. + +In the while(1) the correct exit mechanism should not be to do a direct return, +but to instead break out of the loop, setting err first if it is not already set. + +The reason behind this is that the dnode_path is a linked list, and while doing +through this loop, it is being allocated and built up - the only way to +correctly unravel it is to traverse it, which is what is being done at the end +of the function outside of the loop. + +Several of the existing exit points correctly did a break, but not all so this +change makes that more consistent and should resolve the leaking of memory as +found by Coverity. + +Fixes: CID 73741 + +Signed-off-by: Paulo Flabiano Smorigo <pfsmor...@canonical.com> +Signed-off-by: Darren Kenny <darren.ke...@oracle.com> +Reviewed-by: Daniel Kiper <daniel.ki...@oracle.com> + +Upstream-Status: Backport [https://git.savannah.gnu.org/cgit/grub.git/commit/?id=89bdab965805e8d54d7f75349024e1a11cbe2eb8] +Signed-off-by: Marta Rybczynska <marta.rybczyn...@huawei.com> +--- + grub-core/fs/zfs/zfs.c | 30 +++++++++++++++++++++--------- + 1 file changed, 21 insertions(+), 9 deletions(-) + +diff --git a/grub-core/fs/zfs/zfs.c b/grub-core/fs/zfs/zfs.c +index 0c42cba..9087a72 100644 +--- a/grub-core/fs/zfs/zfs.c ++++ b/grub-core/fs/zfs/zfs.c +@@ -2836,8 +2836,8 @@ dnode_get_path (struct subvolume *subvol, const char *path_in, dnode_end_t *dn, + + if (dnode_path->dn.dn.dn_type != DMU_OT_DIRECTORY_CONTENTS) + { +- grub_free (path_buf); +- return grub_error (GRUB_ERR_BAD_FILE_TYPE, N_("not a directory")); ++ err = grub_error (GRUB_ERR_BAD_FILE_TYPE, N_("not a directory")); ++ break; + } + err = zap_lookup (&(dnode_path->dn), cname, &objnum, + data, subvol->case_insensitive); +@@ -2879,11 +2879,18 @@ dnode_get_path (struct subvolume *subvol, const char *path_in, dnode_end_t *dn, + << SPA_MINBLOCKSHIFT); + + if (blksz == 0) +- return grub_error(GRUB_ERR_BAD_FS, "0-sized block"); ++ { ++ err = grub_error (GRUB_ERR_BAD_FS, "0-sized block"); ++ break; ++ } + + sym_value = grub_malloc (sym_sz); + if (!sym_value) +- return grub_errno; ++ { ++ err = grub_errno; ++ break; ++ } ++ + for (block = 0; block < (sym_sz + blksz - 1) / blksz; block++) + { + void *t; +@@ -2893,7 +2900,7 @@ dnode_get_path (struct subvolume *subvol, const char *path_in, dnode_end_t *dn, + if (err) + { + grub_free (sym_value); +- return err; ++ break; + } + + movesize = sym_sz - block * blksz; +@@ -2903,6 +2910,8 @@ dnode_get_path (struct subvolume *subvol, const char *path_in, dnode_end_t *dn, + grub_memcpy (sym_value + block * blksz, t, movesize); + grub_free (t); + } ++ if (err) ++ break; + free_symval = 1; + } + path = path_buf = grub_malloc (sym_sz + grub_strlen (oldpath) + 1); +@@ -2911,7 +2920,8 @@ dnode_get_path (struct subvolume *subvol, const char *path_in, dnode_end_t *dn, + grub_free (oldpathbuf); + if (free_symval) + grub_free (sym_value); +- return grub_errno; ++ err = grub_errno; ++ break; + } + grub_memcpy (path, sym_value, sym_sz); + if (free_symval) +@@ -2949,11 +2959,12 @@ dnode_get_path (struct subvolume *subvol, const char *path_in, dnode_end_t *dn, + + err = zio_read (bp, dnode_path->dn.endian, &sahdrp, NULL, data); + if (err) +- return err; ++ break; + } + else + { +- return grub_error (GRUB_ERR_BAD_FS, "filesystem is corrupt"); ++ err = grub_error (GRUB_ERR_BAD_FS, "filesystem is corrupt"); ++ break; + } + + hdrsize = SA_HDR_SIZE (((sa_hdr_phys_t *) sahdrp)); +@@ -2974,7 +2985,8 @@ dnode_get_path (struct subvolume *subvol, const char *path_in, dnode_end_t *dn, + if (!path_buf) + { + grub_free (oldpathbuf); +- return grub_errno; ++ err = grub_errno; ++ break; + } + grub_memcpy (path, sym_value, sym_sz); + path [sym_sz] = 0; diff --git a/meta/recipes-bsp/grub/grub2.inc b/meta/recipes-bsp/grub/grub2.inc index 360e86685b..1630235edd 100644 --- a/meta/recipes-bsp/grub/grub2.inc +++ b/meta/recipes-bsp/grub/grub2.inc @@ -68,6 +68,7 @@ SRC_URI = "${GNU_MIRROR}/grub/grub-${PV}.tar.gz \ file://0019-disk-cryptodisk-Fix-potential-integer-overflow.patch \ file://0020-hfsplus-Check-that-the-volume-name-length-is-valid.patch \ file://0021-zfs-Fix-possible-negative-shift-operation.patch \ + file://0022-zfs-Fix-resource-leaks-while-constructing-path.patch \ " SRC_URI[md5sum] = "5ce674ca6b2612d8939b9e6abed32934" SRC_URI[sha256sum] = "f10c85ae3e204dbaec39ae22fa3c5e99f0665417e91c2cb49b7e5031658ba6ea" -- 2.33.0
-=-=-=-=-=-=-=-=-=-=-=- Links: You receive all messages sent to this group. View/Reply Online (#161910): https://lists.openembedded.org/g/openembedded-core/message/161910 Mute This Topic: https://lists.openembedded.org/mt/89229696/21656 Group Owner: openembedded-core+ow...@lists.openembedded.org Unsubscribe: https://lists.openembedded.org/g/openembedded-core/unsub [arch...@mail-archive.com] -=-=-=-=-=-=-=-=-=-=-=-
