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author | Gabor Juhos <juhosg@openwrt.org> | 2010-03-23 08:12:24 +0000 |
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committer | Gabor Juhos <juhosg@openwrt.org> | 2010-03-23 08:12:24 +0000 |
commit | 7892970212bbf062cebcb183543dd5288faa9193 (patch) | |
tree | 7a2dfe45f29b1b13c7a6e15cc2c079d1381a45bb /toolchain/uClibc/patches-0.9.30.2 | |
parent | 3e93541643b7503c981b315e1954f78fe25ee667 (diff) | |
download | master-187ad058-7892970212bbf062cebcb183543dd5288faa9193.tar.gz master-187ad058-7892970212bbf062cebcb183543dd5288faa9193.tar.bz2 master-187ad058-7892970212bbf062cebcb183543dd5288faa9193.zip |
uClibc: fix free-after-use bug in __dns_lookup (closes #6886)
git-svn-id: svn://svn.openwrt.org/openwrt/trunk@20384 3c298f89-4303-0410-b956-a3cf2f4a3e73
Diffstat (limited to 'toolchain/uClibc/patches-0.9.30.2')
-rw-r--r-- | toolchain/uClibc/patches-0.9.30.2/902-Fix-use-after-free-bug-in-__dns_lookup.patch | 45 |
1 files changed, 45 insertions, 0 deletions
diff --git a/toolchain/uClibc/patches-0.9.30.2/902-Fix-use-after-free-bug-in-__dns_lookup.patch b/toolchain/uClibc/patches-0.9.30.2/902-Fix-use-after-free-bug-in-__dns_lookup.patch new file mode 100644 index 0000000000..3a6f43d340 --- /dev/null +++ b/toolchain/uClibc/patches-0.9.30.2/902-Fix-use-after-free-bug-in-__dns_lookup.patch @@ -0,0 +1,45 @@ +From c602079e5b7ba998d1dd6cae4a305af80e6cba52 Mon Sep 17 00:00:00 2001 +From: Gabor Juhos <juhosg@openwrt.org> +Date: Tue, 23 Mar 2010 08:35:27 +0100 +Subject: [PATCH] Fix use-after-free bug in __dns_lookup. + +If the type of the first answer does not match with the requested type, +then the dotted name will be freed. If there are no further answers in +the DNS reply, this pointer will be used later on in the same function. +Additionally it is passed to the caller, and may cause strange behaviour. + +For example, the following busybox commands are triggering a segmentation +fault with uClibc 0.9.30.x + + - nslookup ipv6.google.com + - ping ipv6.google.com + - wget http//ipv6.google.com/ + +Signed-off-by: Gabor Juhos <juhosg@openwrt.org> + +--- + +See https://dev.openwrt.org/ticket/6886 for a testcase +--- + libc/inet/resolv.c | 4 +--- + 1 files changed, 1 insertions(+), 3 deletions(-) + +diff --git a/libc/inet/resolv.c b/libc/inet/resolv.c +index 0a6fd7a..e76f0aa 100644 +--- a/libc/inet/resolv.c ++++ b/libc/inet/resolv.c +@@ -1501,10 +1501,8 @@ int attribute_hidden __dns_lookup(const char *name, + memcpy(a, &ma, sizeof(ma)); + if (a->atype != T_SIG && (NULL == a->buf || (type != T_A && type != T_AAAA))) + break; +- if (a->atype != type) { +- free(a->dotted); ++ if (a->atype != type) + continue; +- } + a->add_count = h.ancount - j - 1; + if ((a->rdlength + sizeof(struct in_addr*)) * a->add_count > a->buflen) + break; +-- +1.5.3.2 + |