X-Git-Url: http://git.ozo.com/?p=openwrt-10.03%2F.git;a=blobdiff_plain;f=toolchain%2FuClibc%2Fpatches-0.9.30.2%2F902-Fix-use-after-free-bug-in-__dns_lookup.patch;fp=toolchain%2FuClibc%2Fpatches-0.9.30.2%2F902-Fix-use-after-free-bug-in-__dns_lookup.patch;h=3a6f43d340a57635d603e417cb8843d521d0fdbd;hp=0000000000000000000000000000000000000000;hb=fadc950fd9ccc9eecb6766b4920e77353ebc2596;hpb=198af969411e3c43da456decba6bfb88666c8e6c 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 000000000..3a6f43d34 --- /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 +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 + +--- + +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 +