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authorMasahiro Yamada <masahiroy@kernel.org>2024-03-23 20:45:11 +0900
committerMasahiro Yamada <masahiroy@kernel.org>2024-03-28 11:04:26 +0900
commit1102f9f85bf66b1a7bd6a40afb40efbbe05dfc05 (patch)
treecb7d19bb1d3cd8d9380c12c07f35c0f9162a2924
parent0316e4b04e0156633df7474bae8e8b0791ce028f (diff)
modpost: do not make find_tosym() return NULL
As mentioned in commit 397586506c3d ("modpost: Add '.ltext' and '.ltext.*' to TEXT_SECTIONS"), modpost can result in a segmentation fault due to a NULL pointer dereference in default_mismatch_handler(). find_tosym() can return the original symbol pointer instead of NULL if a better one is not found. This fixes the reported segmentation fault. Fixes: a23e7584ecf3 ("modpost: unify 'sym' and 'to' in default_mismatch_handler()") Reported-by: Nathan Chancellor <nathan@kernel.org> Signed-off-by: Masahiro Yamada <masahiroy@kernel.org>
-rw-r--r--scripts/mod/modpost.c7
1 files changed, 5 insertions, 2 deletions
diff --git a/scripts/mod/modpost.c b/scripts/mod/modpost.c
index 6b37039c9e92..2f5b91da5afa 100644
--- a/scripts/mod/modpost.c
+++ b/scripts/mod/modpost.c
@@ -1007,6 +1007,8 @@ static Elf_Sym *find_fromsym(struct elf_info *elf, Elf_Addr addr,
static Elf_Sym *find_tosym(struct elf_info *elf, Elf_Addr addr, Elf_Sym *sym)
{
+ Elf_Sym *new_sym;
+
/* If the supplied symbol has a valid name, return it */
if (is_valid_name(elf, sym))
return sym;
@@ -1015,8 +1017,9 @@ static Elf_Sym *find_tosym(struct elf_info *elf, Elf_Addr addr, Elf_Sym *sym)
* Strive to find a better symbol name, but the resulting name may not
* match the symbol referenced in the original code.
*/
- return symsearch_find_nearest(elf, addr, get_secindex(elf, sym),
- true, 20);
+ new_sym = symsearch_find_nearest(elf, addr, get_secindex(elf, sym),
+ true, 20);
+ return new_sym ? new_sym : sym;
}
static bool is_executable_section(struct elf_info *elf, unsigned int secndx)