what is stack smashing detected

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ep.hobbyiest

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Hi
while doing file handling coding i encountered following error.
I was trying to access the file.xlsx
that time error occured. This is as follows

Code:
*** stack smashing detected ***: ./a.out terminated
======= Backtrace: =========
/lib/tls/i686/cmov/libc.so.6(__fortify_fail+0x50)[0x8582d0]
/lib/tls/i686/cmov/libc.so.6(+0xe227a)[0x85827a]
./a.out[0x8048532]
[0x0]
======= Memory map: ========
00776000-008c9000 r-xp 00000000 08:01 1065197    /lib/tls/i686/cmov/libc-2.11.1.so
008c9000-008cb000 r--p 00153000 08:01 1065197    /lib/tls/i686/cmov/libc-2.11.1.so
008cb000-008cc000 rw-p 00155000 08:01 1065197    /lib/tls/i686/cmov/libc-2.11.1.

what is that error means?
 

Programming issue. You overrun the stack that you allocated.
Check for array boundaries overrun.
 

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