Address Out Of Bounds Error In C
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Out Of Bounds Error Python
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error up vote 5 down vote favorite 2 So, I'm learning how to program in C, and I'm having (or at elast, trying to) having some fun with GDB. So I wrote this simple code: #includeArray Out Of Bounds Error
n = atoi(argv[2]); for (i=0; i
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Subscript Out Of Bounds Error In R
Sign up segmentation fault, address out of bounds up vote 1 down vote favorite I'm writing a function that takes a string of input from the user until newline is hit, then parses the string into each word and puts them http://stackoverflow.com/questions/24866919/gdb-address-0xblablabla-out-of-bounds-error into an array. The problem I get is when you first start the program, if you enter in whitespace as input, it gets a segmentation fault. If you put in anything else, it runs fine. Then if you put just whitespace as input after that, it runs fine as well. Here is a snippet of the function: #define MAXARGS 10 char buf[100]; char cmd[MAXARGS][100]; char *bp = NULL; int i, n; for (i = 0; i < MAXARGS; i++) strcpy(cmd[i], ""); fputs(" >> http://stackoverflow.com/questions/6806109/segmentation-fault-address-out-of-bounds ", stdout); fgets(buf, sizeof(buf), stdin); bp = buf; for (i = 0; i < MAXARGS; i++) { sscanf(bp, "%99s%n", cmd[i], &n); bp += n; while (*bp == ' ') // segfault is here bp += 1; } I'm on Windows running MinGW with MSYS. When I run it through GDB I get: Program received signal SIGSEGV, Segmentation fault. 0x0040152d in command () at main.c:46 46 while (*bp == ' ') (gdb) print bp $1 = 0x47291c
(gdb) print *bp Cannot access memory at address 0x47291c ...but I'm not familiar with GDB so I don't know what else to check c pointers segmentation-fault share|improve this question asked Jul 24 '11 at 9:48 hugoblack 813 add a comment| 2 Answers 2 active oldest votes up vote 1 down vote accepted Print n. I suspect it gets a really unexpected value (perhaps negative ? although that's unlikely). share|improve this answer answered Jul 24 '11 at 9:56 cnicutar 121k13191256 So it does! Something in the 2 million range... so I ended up trying to compare something at a memory address that didn't exist. I initialized n to 0 and it fixed the problem. Thank you! –hugoblack Jul 24 '11 at 10:05 1 @hugoblack, you are relying on side effects, you should check the result of sscanf and never use n if the result is not valid. –Arkaitz Jimenez Jul 24 '11 at 11:09 add a comment| up vote 4 down vote sscanf shoulHelp Receive Real-Time Help Create a Freelance Project Hire for a Full Time Job Ways to Get Help Ask a Question Ask for Help Receive Real-Time Help Create a Freelance Project Hire for a Full Time Job Ways to Get https://www.experts-exchange.com/questions/24856490/What-does-out-of-bounds-address-mean-in-gdb.html Help Expand Search Submit Close Search Login Join Today Products BackProducts Gigs Live Careers Vendor Services Groups Website Testing Store Headlines Experts Exchange > Questions > What does "out of bounds" address mean in gdb? Want https://www.sourceware.org/ml/gdb/2015-03/msg00059.html to Advertise Here? Solved What does "out of bounds" address mean in gdb? Posted on 2009-10-29 C 2 Verified Solutions 2 Comments 5,278 Views Last Modified: 2012-05-08 Hi, What does "out of bounds" address mean out of in gdb? I am reading a core file with gdb, and i see the address as out of bounds. i.e. #10 0x00000001000ebc4c in somefunction ( parameter1=0x6
, Thanks Jamie 0 Question by:jamie_lynn Facebook Twitter LinkedIn Google LVL 40 Best Solution bymrjoltcola It usually means the pointer value is bogus (from a memory overwrite) or uninitialized. Simply out, the address is out side of the out of bounds valid memory area of the process. Make sure to initialize all your Go to Solution 2 Comments LVL 40 Overall: Level 40 C 10 Message Accepted Solution by:mrjoltcola2009-10-29 It usually means the pointer value is bogus (from a memory overwrite) or uninitialized. Simply out, the address is out side of the valid memory area of the process. Make sure to initialize all your pointers to 0 or NULL just to make sure. 0 LVL 68 Overall: Level 68 C 5 Message Active today Assisted Solution by:woolmilkporc2009-10-29 Might well be that the core file just doesn't contain the full memory area, due to the core file size limit. Check ulimit -c (maximum core file size in 512 byte blocks) and compare it to the core file's actual size. wmp 0 Write Comment First Name Please enter a first name Last Name Please enter a last name Email We will never share this with anyone. Comment Submit Your Comment By clicking you are agreeing to Experts Exchange's Terms of Use. Featured Post How your wiki can always stay up-to-date Promoted by Quip, Inc Quip doubles as a “living” wiki and a project management tool that evolves with your organization. As you finish projects in Quip, the work remains, easily aThe return address of strtok is out of bounds in gdb From: Yao Qi