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elfutils
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File _service:tar_scm_kernel_repo:backport-libdwfl-Fix-overflow-check-in-link_map.c-read_addrs.patch of Package elfutils
From 394cbe87c349b180a8b2aa4b0868698469d6de95 Mon Sep 17 00:00:00 2001 From: Mark Wielaard <mark@klomp.org> Date: Thu, 6 Jan 2022 16:44:56 +0100 Subject: [PATCH] libdwfl: Fix overflow check in link_map.c read_addrs The buffer_available overflow check wasn't complete. Also check nb isn't too big. https://sourceware.org/bugzilla/show_bug.cgi?id=28720 Signed-off-by: Mark Wielaard <mark@klomp.org> --- libdwfl/link_map.c | 3 ++- 1 file changed, 2 insertions(+), 1 deletion(-) diff --git a/libdwfl/link_map.c b/libdwfl/link_map.c index 0d8d1c1..e7c4173 100644 --- a/libdwfl/link_map.c +++ b/libdwfl/link_map.c @@ -256,7 +256,8 @@ read_addrs (struct memory_closure *closure, /* Read a new buffer if the old one doesn't cover these words. */ if (buffer == NULL || vaddr < *read_vaddr - || vaddr - (*read_vaddr) + nb > *buffer_available) + || nb > *buffer_available + || vaddr - (*read_vaddr) > *buffer_available - nb) { release_buffer (closure, buffer, buffer_available, 0); -- 2.12.3
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