diff options
| -rw-r--r-- | bsd-user/elfload.c | 37 |
1 files changed, 31 insertions, 6 deletions
diff --git a/bsd-user/elfload.c b/bsd-user/elfload.c index 7374912..1ef1f97 100644 --- a/bsd-user/elfload.c +++ b/bsd-user/elfload.c @@ -1044,7 +1044,7 @@ static void load_symbols(struct elfhdr *hdr, int fd) struct elf_shdr sechdr, symtab, strtab; char *strings; struct syminfo *s; - struct elf_sym *syms; + struct elf_sym *syms, *new_syms; lseek(fd, hdr->e_shoff, SEEK_SET); for (i = 0; i < hdr->e_shnum; i++) { @@ -1072,15 +1072,24 @@ static void load_symbols(struct elfhdr *hdr, int fd) /* Now know where the strtab and symtab are. Snarf them. */ s = malloc(sizeof(*s)); syms = malloc(symtab.sh_size); - if (!syms) + if (!syms) { + free(s); return; + } s->disas_strtab = strings = malloc(strtab.sh_size); - if (!s->disas_strtab) + if (!s->disas_strtab) { + free(s); + free(syms); return; + } lseek(fd, symtab.sh_offset, SEEK_SET); - if (read(fd, syms, symtab.sh_size) != symtab.sh_size) + if (read(fd, syms, symtab.sh_size) != symtab.sh_size) { + free(s); + free(syms); + free(strings); return; + } nsyms = symtab.sh_size / sizeof(struct elf_sym); @@ -1105,13 +1114,29 @@ static void load_symbols(struct elfhdr *hdr, int fd) #endif i++; } - syms = realloc(syms, nsyms * sizeof(*syms)); + + /* Attempt to free the storage associated with the local symbols + that we threw away. Whether or not this has any effect on the + memory allocation depends on the malloc implementation and how + many symbols we managed to discard. */ + new_syms = realloc(syms, nsyms * sizeof(*syms)); + if (new_syms == NULL) { + free(s); + free(syms); + free(strings); + return; + } + syms = new_syms; qsort(syms, nsyms, sizeof(*syms), symcmp); lseek(fd, strtab.sh_offset, SEEK_SET); - if (read(fd, strings, strtab.sh_size) != strtab.sh_size) + if (read(fd, strings, strtab.sh_size) != strtab.sh_size) { + free(s); + free(syms); + free(strings); return; + } s->disas_num_syms = nsyms; #if ELF_CLASS == ELFCLASS32 s->disas_symtab.elf32 = syms; |