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Add safeguards against string overflows

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Use snprintf instead of other unsafe functions. That way it is possible
to limit the size of the buffer and to ensure that it never overflows.

Signed-off-by: Antonio Niño Díaz <antonio_nd@outlook.com>
This commit is contained in:
Antonio Niño Díaz
2018-01-08 00:14:44 +00:00
parent 0e0e12a769
commit 2a97535e75
3 changed files with 49 additions and 24 deletions
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4
src/asm/fstack.c
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@@ -347,7 +347,7 @@ void fstk_RunMacroArg(int32_t s)
pushcontext();
nCurrentStatus = STAT_isMacroArg;
sprintf(tzCurrentFileName, "%c", (uint8_t)s);
snprintf(tzCurrentFileName, _MAX_PATH + 1, "%c", (uint8_t)s);
CurrentFlexHandle = yy_scan_bytes(sym, strlen(sym));
yy_switch_to_buffer(CurrentFlexHandle);
}
@@ -410,7 +410,7 @@ void fstk_Init(char *s)
nMacroCount = 0;
nCurrentStatus = STAT_isInclude;
strcpy(tzCurrentFileName, tzFileName);
snprintf(tzCurrentFileName, _MAX_PATH + 1, "%s", tzFileName);
CurrentFlexHandle = yy_create_buffer(pCurrentFile);
yy_switch_to_buffer(CurrentFlexHandle);
nLineNo = 1;