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Fix NULL pointer deref in main due to base_locals

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For fun I tried to create a livepatch of upstream patch
ad211f3e94b314a910d4af03178a0b52a7d1ee0a for my kernel. This
caused kpatch-build to fail with a NULL pointer derefence because
base_locals was NULL (returned via kpatch_elf_locals(), which
can return a NULL pointer). This patch fixes the SIGSEGV
via a NULL check. The end result is a live patch is created
and loaded.

Signed-off-by: Balbir singh <bsingharora@gmail.com>
This commit is contained in:
Balbir singh 2019-01-17 19:53:46 +11:00
parent b29227547d
commit 3998784d71
1 changed files with 1 additions and 1 deletions
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2
kpatch-build/create-diff-object.c
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@ -3332,7 +3332,7 @@ int main(int argc, char *argv[])
/* create symbol lookup table */ /* create symbol lookup table */
lookup = lookup_open(parent_symtab, mod_symvers, hint, base_locals); lookup = lookup_open(parent_symtab, mod_symvers, hint, base_locals);
for (sym_comp = base_locals; sym_comp->name; sym_comp++) { for (sym_comp = base_locals; sym_comp && sym_comp->name; sym_comp++) {
free(sym_comp->name); free(sym_comp->name);
} }
free(base_locals); free(base_locals);