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base64: check for integer overflow on large input

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CVE-2016-8617

Bug: https://curl.haxx.se/docs/adv_20161102C.html
Reported-by: Cure53
This commit is contained in:
Daniel Stenberg 2016-09-28 00:05:12 +02:00
parent 3d6460edee
commit efd24d5742
1 changed files with 5 additions and 0 deletions
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5
lib/base64.c
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@ -190,6 +190,11 @@ static CURLcode base64_encode(const char *table64,
if(!insize) if(!insize)
insize = strlen(indata); insize = strlen(indata);
#if SIZEOF_SIZE_T == 4
if(insize > UINT_MAX/4)
return CURLE_OUT_OF_MEMORY;
#endif
base64data = output = malloc(insize * 4 / 3 + 4); base64data = output = malloc(insize * 4 / 3 + 4);
if(!output) if(!output)
return CURLE_OUT_OF_MEMORY; return CURLE_OUT_OF_MEMORY;