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coverity/13687: Do not allow NUL byte in region names

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This commit is contained in:
ZyX
2017-04-09 22:02:26 +03:00
parent 5b4f07ee86
commit ecce981dba
2 changed files with 57 additions and 12 deletions
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51
src/nvim/spellfile.c
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@@ -494,6 +494,41 @@ typedef struct spellinfo_S {
# include "spellfile.c.generated.h"
#endif
/// Read n bytes from fd to buf, returning on errors
///
/// @param[out] buf Buffer to read to, must be at least n bytes long.
/// @param[in] n Amount of bytes to read.
/// @param fd FILE* to read from.
///
/// @return Allows to proceed if everything is OK, returns SP_TRUNCERROR if
/// there are not enough bytes, returns SP_OTHERERROR if reading failed.
#define SPELL_READ_BYTES(buf, n, fd) \
do { \
const size_t n__SPRB = (n); \
FILE *const fd__SPRB = (fd); \
char *const buf__SPRB = (buf); \
const size_t read_bytes__SPRB = fread(buf__SPRB, 1, n__SPRB, fd__SPRB); \
if (read_bytes__SPRB != n__SPRB) { \
return feof(fd__SPRB) ? SP_TRUNCERROR : SP_OTHERERROR; \
} \
} while (0)
/// Like #SPELL_READ_BYTES, but also error out if NUL byte was read
///
/// @return Allows to proceed if everything is OK, returns SP_TRUNCERROR if
/// there are not enough bytes, returns SP_OTHERERROR if reading failed,
/// returns SP_FORMERROR if read out a NUL byte.
#define SPELL_READ_NONNUL_BYTES(buf, n, fd) \
do { \
const size_t n__SPRNB = (n); \
FILE *const fd__SPRNB = (fd); \
char *const buf__SPRNB = (buf); \
SPELL_READ_BYTES(buf__SPRNB, n__SPRNB, fd__SPRNB); \
if (memchr(buf__SPRNB, NUL, (size_t)n__SPRNB)) { \
return SP_FORMERROR; \
} \
} while (0)
// Load one spell file and store the info into a slang_T.
//
// This is invoked in three ways:
@@ -935,12 +970,10 @@ static char_u *read_cnt_string(FILE *fd, int cnt_bytes, int *cntp)
// Return SP_*ERROR flags.
static int read_region_section(FILE *fd, slang_T *lp, int len)
{
int i;
if (len > 16)
if (len > 16) {
return SP_FORMERROR;
for (i = 0; i < len; ++i)
lp->sl_regions[i] = getc(fd); // <regionname>
}
SPELL_READ_NONNUL_BYTES((char *)lp->sl_regions, (size_t)len, fd);
lp->sl_regions[len] = NUL;
return 0;
}
@@ -1004,13 +1037,7 @@ static int read_prefcond_section(FILE *fd, slang_T *lp)
if (n > 0) {
char buf[MAXWLEN + 1];
buf[0] = '^'; // always match at one position only
const size_t read_byte = fread(buf + 1, 1, (size_t)n, fd);
if (read_byte != (size_t)n) {
return feof(fd) ? SP_TRUNCERROR : SP_OTHERERROR;
}
if (memchr(buf + 1, NUL, (size_t)n)) {
return SP_FORMERROR;
}
SPELL_READ_NONNUL_BYTES(buf + 1, (size_t)n, fd);
buf[n + 1] = NUL;
lp->sl_prefprog[i] = vim_regcomp((char_u *)buf, RE_MAGIC | RE_STRING);
}