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| author | Masahiro Yamada <masahiroy@kernel.org> | 2024-03-23 12:45:11 +0100 |
|---|---|---|
| committer | Masahiro Yamada <masahiroy@kernel.org> | 2024-03-28 03:04:26 +0100 |
| commit | 1102f9f85bf66b1a7bd6a40afb40efbbe05dfc05 (patch) | |
| tree | cb7d19bb1d3cd8d9380c12c07f35c0f9162a2924 /scripts/mod | |
| parent | export.h: remove include/asm-generic/export.h (diff) | |
| download | linux-1102f9f85bf66b1a7bd6a40afb40efbbe05dfc05.tar.xz linux-1102f9f85bf66b1a7bd6a40afb40efbbe05dfc05.zip | |
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>
Diffstat (limited to 'scripts/mod')
| -rw-r--r-- | scripts/mod/modpost.c | 7 |
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) |