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authorUmang Jain <email@uajain.com>2020-06-07 14:30:18 +0000
committerLaurent Pinchart <laurent.pinchart@ideasonboard.com>2020-06-07 18:36:44 +0300
commit79d666247182b0e42560ab505c29173ca94bdbb0 (patch)
treea4657250156ecd0d7f0cd4256a7391e5f00cf6e9
parent6f6da7f8542481de8712bd46b720da9b13ce2e9c (diff)
libcamera: ipa_module: Fix implicit sign-extension in elfSection
Given how the elfSection() function uses the sub-expression (idx * eHdr->e_shentsize) it has effectively two (16 bits, unsigned) operands. The sub-expression is promoted to type int (32 bits, signed) for multiplication and then added to eHdr->e_shoff, which is uint32_t on 32-bit platforms and uint64_t on 64-bit platforms. Since eHdr->e_shoff is unsigned, the integer conversion rules dictate that the other signed operand (i.e. the result of aforementioned sub-expression) will be converted to unsigned type too. This causes sign-extension for both of the above operands to match eHdr->e_shoff's type and should be avoided. The solution is to explicitly cast one of the operands of the sub-expression with unsigned int type. Hence, the other operand will be integer promoted and the resultant will also be of unsigned int type, not requiring to bother about a sign-extension. Reported-by: Coverity CID=280008 Reported-by: Coverity CID=280009 Reported-by: Coverity CID=280010 Signed-off-by: Umang Jain <email@uajain.com> Reviewed-by: Kieran Bingham <kieran.bingham@ideasonboard.com> Reviewed-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com> Signed-off-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
-rw-r--r--src/libcamera/ipa_module.cpp3
1 files changed, 2 insertions, 1 deletions
diff --git a/src/libcamera/ipa_module.cpp b/src/libcamera/ipa_module.cpp
index 60aaa344..72e357ec 100644
--- a/src/libcamera/ipa_module.cpp
+++ b/src/libcamera/ipa_module.cpp
@@ -93,7 +93,8 @@ ElfW(Shdr) *elfSection(Span<uint8_t> elf, ElfW(Ehdr) *eHdr, ElfW(Half) idx)
if (idx >= eHdr->e_shnum)
return nullptr;
- off_t offset = eHdr->e_shoff + idx * eHdr->e_shentsize;
+ off_t offset = eHdr->e_shoff + idx *
+ static_cast<uint32_t>(eHdr->e_shentsize);
return elfPointer<ElfW(Shdr)>(elf, offset);
}