Mercurial > vim
view src/osdef1.h.in @ 33815:08f9e1eac4cf v9.0.2123
patch 9.0.2123: Problem with initializing the length of range() lists
Commit: https://github.com/vim/vim/commit/df63da98d8dc284b1c76cfe1b17fa0acbd6094d8
Author: Christian Brabandt <cb@256bit.org>
Date: Thu Nov 23 20:14:28 2023 +0100
patch 9.0.2123: Problem with initializing the length of range() lists
Problem: Problem with initializing the length of range() lists
Solution: Set length explicitly when it shouldn't contain any items
range() may cause a wrong calculation of list length, which may later
then cause a segfault in list_find(). This is usually not a problem,
because range_list_materialize() calculates the length, when it
materializes the list.
In addition, in list_find() when the length of the range was wrongly
initialized, it may seem to be valid, so the check for list index
out-of-bounds will not be true, because it is called before the list is
actually materialized. And so we may eventually try to access a null
pointer, causing a segfault.
So this patch does 3 things:
- In f_range(), when we know that the list should be empty, explicitly
set the list->lv_len value to zero. This should happen, when
start is larger than end (in case the stride is positive) or
end is larger than start when the stride is negative.
This should fix the underlying issue properly. However,
- as a safety measure, let's check that the requested index is not
out of range one more time, after the list has been materialized
and return NULL in case it suddenly is.
- add a few more tests to verify the behaviour.
fixes: #13557
closes: #13563
Co-authored-by: Tim Pope <tpope@github.com>
Signed-off-by: Christian Brabandt <cb@256bit.org>
| author | Christian Brabandt <cb@256bit.org> |
|---|---|
| date | Thu, 23 Nov 2023 20:30:07 +0100 |
| parents | 9781c150eddd |
| children |
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/* autoconf cannot fiddle out declarations. Use our homebrewn tools. (jw) */ /* * Declarations that may cause conflicts belong here so that osdef.sh * can clean out the forest. Everything else belongs in os_unix.h * * How this works: * - This file contains all unix prototypes that Vim might need. * - The shell script osdef.sh is executed at compile time to remove all the * prototypes that are in an include file. This results in osdef.h. * - osdef.h is included in vim.h. * * sed cannot always handle so many commands, this is file 1 of 2 */ extern int printf(char *, ...); extern int fprintf(FILE *, char *, ...); extern int sprintf(char *, char *, ...); extern int sscanf(char *, char *, ...); #ifndef fopen /* could be redefined to fopen64() */ extern FILE *fopen(const char *, const char *); #endif extern int fclose(FILE *); extern int fseek(FILE *, long, int); #ifdef HAVE_FSEEKO extern int fseeko(FILE *, off_t, int); #endif extern long ftell(FILE *); #ifdef HAVE_FSEEKO extern off_t ftello(FILE *); #endif extern void rewind(FILE *); extern int fread(char *, int, int, FILE *); extern int fwrite(char *, int, int, FILE *); extern int fputs(char *, FILE *); #ifndef ferror /* let me say it again: "macros should never have prototypes" */ extern int ferror(FILE *); #endif extern int fflush(FILE *); #if defined(sun) || defined(_SEQUENT_) /* used inside of stdio macros getc(), puts(), putchar()... */ extern int _flsbuf(int, FILE *); extern int _filbuf(FILE *); #endif #if !defined(HAVE_SELECT) struct pollfd; /* for poll() */ extern int poll(struct pollfd *, long, int); #endif #ifdef HAVE_MEMSET extern void *memset(void *, int, size_t); #endif extern int memcmp(const void *, const void *, size_t); #ifdef HAVE_STRPBRK extern char *strpbrk(const char *, const char *); #endif #ifdef USEBCOPY extern void bcopy(char *, char *, int); #else # ifdef USEMEMCPY extern void memcpy(char *, char *, int); # else # ifdef USEMEMMOVE extern void memmove(char *, char *, int); # endif # endif #endif #if !defined(__BIONIC__) && !defined(__HAIKU__) // Android's libc #defines bzero to memset. // used inside of FD_ZERO macro extern void bzero(void *, size_t); #endif #ifdef HAVE_SETSID extern pid_t setsid(void); #endif #ifdef HAVE_SETPGID extern int setpgid(pid_t, pid_t); #endif #ifdef HAVE_STRTOL extern int strtol(char *, char **, int); #endif #ifdef HAVE_STRFTIME extern size_t strftime(char *, size_t, char *, struct tm *); #endif #ifdef HAVE_STRCASECMP extern int strcasecmp(char *, char *); #endif #ifdef HAVE_STRNCASECMP extern int strncasecmp(char *, char *, size_t); #endif #ifndef strdup extern char *strdup(const char *); #endif extern int atoi(char *); extern int atol(char *); #ifndef USE_SYSTEM extern int fork(void); # ifndef __TANDEM extern int execvp(const char *, const char **); # endif extern int wait(int *); /* will this break things ...? */ extern int waitpid(pid_t, int *, int); #endif extern int toupper(int); extern int tolower(int); extern void (*signal(int, void (*func) SIGPROTOARG)) SIGPROTOARG; #ifdef HAVE_SIGSET extern void (*sigset(int, void (*func) SIGPROTOARG)) SIGPROTOARG; #endif #if defined(HAVE_SETJMP_H) # ifdef HAVE_SIGSETJMP extern int sigsetjmp(sigjmp_buf, int); extern void siglongjmp(sigjmp_buf, int); # else extern int setjmp(jmp_buf); extern void longjmp(jmp_buf, int); # endif #endif extern int kill(int, int); #ifndef __TANDEM extern int access(char *, int); #endif extern int fsync(int); extern int fchown(int, int, int); #if defined(HAVE_GETCWD) && !defined(sun) && !defined(__TANDEM) extern char *getcwd(char *, int); #else extern char *getwd(char *); #endif #ifndef __alpha /* suggested by Campbell */ extern int ioctl(int, int, ...); #endif extern int chmod(const char *, mode_t);